crux131
+1y
On my extended cab 86' b2000, I used to have a over the rails( low profile ) cover from a 2000ish ranger extended cab.
Bought it from a friend. I had to modify the frame some( bolted together, just had to reposition the rails and run the bolts down ). It was a close fit, but the bed rails are spaced a little differently.
Don't remember how much shifting was involved, and don't have it anymore. I do remember it was fairly easy though.
Like mentioned above, take some measurements and maybe trial fit it to get an idea. Make sure you take the differing width from both sides of the tonneau. This will keep everything centered.