funny shaped reciever please help

I have a 96 Saturn SL. I want replace the stock reciever with one I already own.  The one I want to use to replace the stock unit is a panasonic that is a couple years old. it works fine and ive had it in a few of my other cars. I cant afford to buy a different reciever or get a professional install. the stock reciever in the car (and therefore the hole in the dash it creates in its absence) is an odd trapezoid shape. is there any to install my aftermarket cd player short of a custom fabbed piece to fill in the remaining space? Are there any kits available for this application? Please help if you have any suggestions or tricks. I am at a loss. Thanks in advance!