If it weren't for the clearance issues noted on the FD, I'd go with the newer style RB/MT piece. Stay away from ReSpeed - word is out that they are not delivering what folks have paid for these days.
The one downside I've heard on the Prosport sandwich style is that they eventually leak. Reason is the sandwich design, which retains the stock oil filter pedestal which seals to the Prosport adapter with basically one big O-ring/oil filter seal. That seal will either break down or loosen up after numerous oil filter changes, resulting in a messy and potentially catastrophic leak.
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