Brilliant, thank you. I had my suspicions that it was 5/120 but I just didn't know for sure.
I've got the non-M sport 130i, and I believe mine are the styling 141's (http://felgenkatalog.auto-treff.com/showpic.php?nr=141
) which really are nice enough as it is, but I'm just itching to replace them for some reason
Thanks for your response, this definitely helps