I've got an old truck. Got a new stereo/headunit for Christmas. One of my boys bought it from the link I sent to general-fitting stuff at crutchfield.com. Stereo came with no installation stuff, and since I've bought a fair bit of stuff from them in the past, I started chatting with their customer service people. They were awesome - told them the make/model/year/accessories etc. and they sent me all the installation stuff I needed for free. I rate their customer service off the charts.