Kryptonite: Doesn't look like they will fit as the outer diameter is too large. Mounting depth isn't an issue.

Sablonty: Dynaudio System 220 MKII's are a bit small but a very good fit with an adapter ring. Not cheap, but they sound phenomenal in these cars, especially if you put the tweets on the dash. They are bigger than 5.25" but not quite a 6.5." They are listed as a 5.75" driver. Aftermarket amp is required for these.

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