91 Cheyenne aftermarket radio
 

So I have a 91 cheyenne c1500 and I want to put in a stereo but I'm uncertain if I have to get a specific size for my truck k because of the auxiliary compartment in the middle, a regular radio is too long to put where the stock radio is at and I've seen them in the middle before. Any ideas?
Ps-i already have a Sony mex-BT39UW radio but I'm unsure how to install it myself.