I could send you more close up pictures through the email if you would like.
The inside of my bed has the same dimensions, 49" Wide X 76" Long, if you are considering purchasing one, I could sell you mine. It is a hard tonneau cover, painted red. My email address is firstname.lastname@example.org if you are interested.
I'm not sure at the moment but I will measure it tonight and get back to you.
I'm John from NJ. I have a custom Dodge Ram with a Fiberglass step side bed like the Chevys have but with Dodge tail lights. I am trying to find a bed cover for it. All the companies out there will not help because it's not in their catalogs. I heard that the 88-98 Chevy has the same size bed.
I was wondering if you know how Wide and Long your Chevy bed is inside at the top of the bed.
Mine is 49" wide inside by 76" long inside.
I really appreciate the help!