I know I had a pain-in-the-ass time trying to fit my 6x9's into the parcel shelf of my Toyota Corona, would never attempt it again!
Tas: Also it's illegal to cut any metal out of your parcel shelf so dont be tempted to cut the metal, just the wood.
Bugger, I hope that doesnt affect the sale of my car
I had to cut a little bit to fit the speaker cones, but it's not that noticable