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It's really hard to find good wheels for the Z4Ms (in my opinion). Volk (by Rays) certainly tick the quality and weight boxes and the price is reasonable in comparison to HRE, Forgeline, etc that - arguably - use an inferior forging process. Look at the Rays Japan website, but there are only a few models that have the right PCD and offsets for us.
The forged Advan wheels (made by Rays) are another option but they also only have a couple of styles that are compatible with our cars (I have forged Advans and they are super light).
If you want really light, high-quality forged wheels, check out the T66F from TWS Forged in Japan. TWS use the same forging process as Rays (maybe from the same forge?). From memory, the T66F are 6.9kg for 18 x 8.5 +35.
I love BBS RG-Rs but they aren't that light and as far as I can see, the 18 x 10" +25 rear is no longer available, so you would have to go with the 9.5" +33 and maybe use spacers (depending on your aesthetic preferences).
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