So, I purchased 12" Minator wheels at Minimania for my MK3 about 20 years ago. As I am approaching the 25th year of owning my Mini, I am thinking about upgrading the wheels--but, in talking with vendors, they are asking some questions about specs and offset, as I am looking at some 5.5x12 wheels (and can't recall the specifics of what I have). Does anyone have this info? I can't seem to find a 'corporate' site for Minator, which is where I thought I'd start.

Thanks in advance.