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Ahhhhh.......air cooled body with 996 running gear.....cool stuff, thought about that many times. ....
i don't have one at home i can measure, but have 4 or 5 at the shop......so could probably measure next week......
C2 and c4 are the same except for the torque tube and front spindles from what I've seen.
The lower suspension points all bolt to a front and rear sub frame, are you modding the chassis to accommodate these? That's how i'd do it lol