[SS Tim]

That is pretty much it in a nutshell. A/C or not and High Hump (removable cover) or Low Hump (formed floorpan). Factory Bucket Seats have a different floor build for buckets. The roof panel is different if a truck has factory Roof Marker Lamps. Headliner slots, and Cargo Lamp are detail differences that can be added but kind of hard to remove.

But then there is that pesky question on VIN plates too.....