My dads truck stereo broke. I don't have a lot of money but I want to buy him a stereo for his truck at walmart. I thought they might be less expensive there. Only problem is I don't know how to find one. I want to order it online, but how do I know what type and size is compatible with his truck. Please help ![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)