Oh you most certainly can put in after market if you prefer. There is an after market kit cheap for these now. I had an 89 1/2 ton and I just went to good stereo shop and bought the relocation kit. Wiring harness and dash/ vent kit, no cutting wires either. If you have some sockets a philips screw driver and 2 fingers your done...otherwise the wrecking yard is full of stock AM/FM stereo's I was in one today up here in Canada.
I would imagine Nebraska has its share of wreckin' yards...:lol: