You are correct on location ,I have a 73 squire I did not need to build custom rear panels ,there is an area just past rear wheel wells that will accept 6x9's and that the rear seat operates as normal. I did however have to cut some sheet metal behind where I mounted them ,so the magnet and part of speaker would fit into the recess. It ended up a clean install and overall sound is good.,my next part will be front speakers.