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I was a wheel nubie and worked my way through this process a few years back with lots of help from this forum! Turns out that there are TONS of different BBS RGR models, even with the same 18" diameter. To determine fit and potential rubbing, you need to consider a bunch of things, including the width/offset of the particular set of wheels you are looking at, as well as your personal setup (any modifications) on both front and rear. This thread walks through my journey of learning and buying my RGRs: https://www.rx7club.com/suspension-w...-18-s-1109782/
I have a stock setup and ultimately went with four of the RG750 18×8.5 (+53). No rubbing issues at all.
Never did find an OEM Mazda flying M center cap : (