having been this route on my e28, caliper paint is IMHO necessary/preferable with open spoke wheels.

the best option? i would order a set of remanufactured calipers on the cheap from rock auto. send them to get powdercoated or paint them yourself. swap em out with the originals and send the old ones in for credit.

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2005 X5 3.0i - 71k mi (9.2018) -> 81k (9.2019) -> 100k (9.2021) -> 123k (8.2025)
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SOLD : 2003 X5 3.0 - 177k mi (9.2018) -> 186k (9.2019) -> 205k (9.2021)
SOLD : 1997 328is Coupe - Hellrot Red
SOLD : 1988 528e w/ Bullseye s256 / MS2 Extra / GC Coilovers / Yukon Coils ~ 300+ HP