FWIW, I measured the flange on my Doug's D-port D564s tonight, and it measured at 10.21mm. The engine's not in the car yet, so time will tell.
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1966 Pontiac GTO ( restoration thread)
1998 BMW 328is ( track rat)
2023 Subaru Crosstrek Limited ( daily)
View my photos: Caught in the Wild
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