Have you tried, of all places
, JC Whitney?
I bought a molded carpet set for my 1988 Toyota single cab pickup from them and it fit, kind of. Whoever marked the hole to cut for the shifter marked it in the wrong spot. So, of course, it no longer "fit". Since it was ruined anyway, I cut the hole in the correct location just to test fit it to see if it fit correctly and it did.
So, I bought another one but have not installed it yet. Also, even though I have the cheapest, base, long bed truck, I bought the carpet meant for a higher level model with bucket seats so that it goes all the way back to the rear wall instead of just stopping at the bottom of the front of the bench seat.
But this was about 10 (?) years ago. I don't know how far back their supplier can make kits...http://www.jcwhitney.com/carpet-and-flo ... y1991g1001