The 1M does have a rear bar that is 22.5mm, but it shows a different part number. For some reason it's about $50 cheaper at retail, but none in the country. Same size as the E90/92 M3 bar, uses the same bushings as the M3, but cheaper. Hmm... Or there's the E93 M3 bar that's 23.6mm, which is also $50 more than the 1M bar. Choices, choices....
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