Mounting depth for the SSCS6's is 3.1 inches. Taken from Crystal's web site....My thoughts too. I heard you need 7 1/4" mounting area for the Crystals and I think they are rather deep. Trying to get info on whether they will fit in a 1995 Cavalier's door or not. That may decide it for me!
I was thinking about your install some more. According to Crutchfield's test of door space they have 2.81" mounting space to the rear. The specs on the HD-62's driver is 2.75" mounting depth:the mounting depth in cavalier doors is not much at all, i had to build i baffle to get my hd-6's to fit in:
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