Well I don't know how the Aussie 82 Corona is built, but my 79 had kickpanel speakers. The rears were 6x8, but since they weren't installed I had to cut the holes. I foolishly tried using the factory stereo wiring, and had to find out the hard way that that's a no-no. Anyway, I installed Infinity 4" speakers in the kickpanel right were the factory speakers were. I installed Infinities in the rear as well. My HU is a Kenwood Excelon CD receiver. Sounds awesome! BTW, ended up running new speaker wires to all four speakers.