Rear Speaker adapters from Crutchfield
 

Just a word of warning, I replaced my speakers in my Camaro , In the back i ordered a kit from Crutchfield that had the adapters i needed. They work and better than cutting old speakers to use the mounts ,BUT if you get these adapters put some kind of foam or insulation on them before you mount them or they will rattle like crazy. Its just plastic on metal and it fits loose! I thought i had a blown speaker until i investigated it further. I looked at the factory speakers and surprise, they have a foam seal on them !!, Now to take the whole back interior out again:mad0259: