Short answer: measure the inside of the bed floor, from the inside face of the bulkhead to the inside face of the closed tailgate. Then compare that number — not the marketing name — against what you are buying. “6.5ft” and “6.6ft” are usually the same physical bed, rounded differently from the same measurement.
Why the two numbers exist
Manufacturers name bed lengths in round marketing terms — 5.5, 6.5, 8 foot. The actual stamped box rarely matches that number exactly. A bed that measures around 78 to 79 inches internally is 6.5 feet if you round down and 6.6 feet if you convert honestly, and both appear in listings for the same part.
Sellers then inherit whichever convention their source used. Ours are listed the way the number came to us, which is why you will see both on this site and across every other yard’s inventory. It is not a different bed. The fix is to stop trading in names and start trading in inches.
How to measure — the only method that matters
- Drop the tailgate and clear the bed. Liners, mats and bedliners all change what your tape reads. A spray-in liner can add a quarter inch per surface.
- Close the tailgate. Measure with it shut, not open.
- Run the tape along the bed floor, from the inside face of the front bulkhead to the inside face of the tailgate.
- Take it down the centre, not along the side rail — wheel well intrusion and rail curvature will give you a different figure at the edge.
- Record the inches. Not the feet. Inches are what interchange is decided on.
While you have the tape out, take two more measurements that matter as much as length and that almost nobody records:
- Width between the wheel wells — this determines whether sheet goods lie flat, and it varies more than people expect between generations.
- Bed depth at the bulkhead — a bed swap between generations can change your load height even when the length matches.
Approximate lengths by platform
Use these to narrow a search, never to confirm a purchase. Trim, model year and mid-cycle changes all move these figures, so measure the specific truck.
| Platform | Common name | Roughly |
|---|---|---|
| GM 1500 (1999–2006) | Short bed | ~78–79 in — listed as both 6.5 and 6.6 ft |
| GM 1500 (1999–2006) | Long bed | ~96 in — 8 ft |
| GM extra short | Stepside / short | ~71 in — listed around 5.9 ft |
| Ford F-150 (2009–2014) | Extra short | ~67 in — 5.5 ft |
| Ford Super Duty | Short bed | ~81 in — listed 6.75 or 6.9 ft |
| Dodge Ram (1994–2002) | Long bed | ~96 in — 8 ft |
Things that are not length but will still stop the swap
A bed can measure correctly and still be the wrong bed. Before you commit, check:
- Bed mount locations. Frame crossmember positions changed between generations. A correct-length bed from the wrong generation will not line up on the mounts.
- Fuel filler side and height. Getting a bed whose filler is on the wrong side, or at the wrong height for your neck, is one of the most common expensive mistakes.
- Wiring and tail light connectors. Connector styles changed within platforms. Adapters exist, but know before it arrives.
- Dually vs single rear wheel. Obvious on sight, still bought wrong regularly.
- Tailgate included or not. Tailgates are frequently sold separately and are a meaningful cost on their own.
What to ask a seller
Whoever you buy from — us or anyone else — these five questions separate a real listing from a guess:
- What does it measure inside, in inches, tailgate closed?
- What was the donor truck — year, model, cab configuration?
- Which side is the fuel filler on?
- Is the tailgate included, and does it match?
- Can I see photographs of the bed floor, the front bulkhead corners and the underside of the rails?
That last one is where beds actually fail. The floor and the lower bulkhead corners hold water and road salt, and a bed can look excellent from the side while the corners are gone. Any seller unwilling to photograph those areas is telling you something.
Why we only stock dry-climate boxes
A truck bed is one of the parts where origin matters more than age. A twenty-year-old box from a dry state routinely has a cleaner floor than a ten-year-old one from a region that salts its roads all winter. Rust starts under the bed rails and in the floor seams where you cannot see it, and by the time it shows on the outside the structure is already compromised.
Everything in our truck bed inventory is sourced from dry regions and photographed including the areas that fail first — not just the good side.
Common questions
Is a 6.5ft bed the same as a 6.6ft bed?
On 1999–2006 GM 1500s, almost always yes — the same physical box, rounded differently. Confirm by inches rather than by the name.
Do I measure with the tailgate up or down?
Up. Closed tailgate, inside face to inside face.
Will a short bed from a different generation bolt to my frame?
Not reliably. Bed mount positions changed between generations even where length did not. Match the generation.
Does a bed liner affect the measurement?
Yes. Remove drop-in liners before measuring, and note that spray-in coatings add thickness to every surface.
Measuring something and not sure what you have? Send us the inches and a photo of the bulkhead and we will tell you what it came off — no obligation.
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