[Stinkyxy]

I have a 2014 550ix and I am looking to put on 343m 20” wheels I picked up. I’ve read everywhere that I need a 3-5mm spacer to clear the brakes.

H&R have 2 part numbers:
0675725 and 065726.
Both have the same specs, hub, etc.
550 is list as 725 and f10 and m5 listed as 726.

Would anyone know the difference?

Thanks