I can get you some measurements tomorrow or something. There is no way it would fit on your 4runner if you cut the top off like that picture. only way it would work is if you cut the top down a lot and I dunno how well it would fit with the body lines of a second gen 4runner.
I'm thinking not well. I bought and parted out a 1st gen runner, and took the top to the buyer of it in my truck, first tried putting it on like a runner, wound up having to flip it over and let it sit in the bed. I'd assume the 2nd gen runner is about the same width as the 3rd gen truck, just like the 2nd gen truck is the same width of the 1st gen runner.
If you were to cut it like that pic, I wonder if you could cut it to match the lines of something like an amigo hardtop, and then use your mad fiberglass skills to widen that top to the correct width?
![I Dunno... :dunno:](https://board.marlincrawler.com/Smileys/marlin/dunno.gif)