So I have a 2003 mini that I totaled sitting in my backyard, and I need a regulator for my newer 2006. I figure since they're both r53 it should be interchangeable, and I couldn't get a definitive answer online.

Would that work?

 

Yes, both have the same part numbers. You can always use our parts catalog to compare part numbers.

2003 regulator - 2003 Mini Cooper Base Hatchback - Panels & Doors - Page 1
2006 regulator - http://www.pelicanparts.com/catalog/..._pg1.htm#item3