Ok, I had a 79, and easily threw some 5 1/4" behind the seats, holes matched up perfectly! On my 82, I go to put some 6.5" today to see how they fit, and the things are WAY off. They go in the hole, but the places where the screws go, are no where near the 6.5" speaker. The speaker appears to be too small. What size came stock in the rear on an 82, were they bigger than the 79s or what? My friend has a set of 3 way MB Quarts he's gonna sell me and I was curious if the 5 1/4" that comes with it will fit in the back or not.