Yes they make a solid back glass for an 87 cab plus. I just swapped my sliding back glass for my old solid one. It kinda sucks doing it by yourself so if you can, get a friend to help.
I got mine through my dad who works for the local ford dealership he gets hook ups everywhere.. There putting it in for me monday.. The slider is the worst thing ever.
Its a pain in the ass by yourself for sure but even still I took the sliding glass out and installed the solid glass all in less than an hour. You should seriously get someone to help you though, it will go even faster.