Bed size of 1st gen Tacoma vs later generations?

I have a 1998 PreRunner extended cab with a 74" bed. I have been looking for a tall, light weight (re aluminum but not molded fiberglass) camper or pop up camper that fits. So far - other than fiberglass shells like Leer or ARE - every other company I have found says they have mid size or large truck campers. Most specifically state Tacomas 2005+. (That's when Tacomas became mid-size right?) I want to be able to stand up in it or come close to it. (5'-5") I also do not want it already built out. I want to do that myself so all I want is a tall, reasonably lightweight camper that sits on the rails (not a slide in).

Anyway, what is the difference in the bed sizes from 1st gen to later gens? So far the numbers I have found are all over the place so I'm not confident they are correct.

Also, if any of you know of anyone who sells a camper like this please post a link.

Edit to include the following:
This is something like the kind of camper I am looking for but they don't seem to be currently available. (callencampers.com)

 

Dimensions are here:
https://raybuck.com/pickup-truck-bed-size-dimensions/

Tall and light you're going to want someting like an ARE DCU.

 

Companies like Tradesman will custom build you a custom camper shell too.

 

Thanks for the bed size link. Very useful. Interesting that the interior dims from 1st gen to later gens are very close but the exterior dims are quite a bit different especially on the width. I am wondering if some of the toppers that are made to fit later gens might fit a 1st gen.

It appears the ARE DCUs do not have windows on the sides and are more of a contractor style.

 

Thanks for the Tradesman tip. Their custom cab overs look solid.

 

Yeah, they’re pretty sweet.
I think they’re way more dust proof than most too.
Maybe someone who actually knows will chime in.

 

I had a ARE DCU shell made for a 2005+ on my 95 tacoma. It fit, but not well. Width wise the newer Tacoma tapers outwards towards the front and in the 95 each side stuck out about 2-3” in front but was even at the back. It was also slightly short in length so didn’t seal well. Not really sure what that was though...