just fyi, if you want a dedicated set, you can try buying OEM 19 inch wheels from the M6 coupe and maybe the M5 (M5 offsets are different). I'm going to guess you can find more options in the 19 inch sizes:
M6 Style 344: 19x9.5, 19x10.5 265/40/19 295/35/19
M5 Style 345: 19x9, 19x10
https://www.ecstuning.com/Search/SiteSearch/style_345/