Hello

I am struggling to find the information I need, so please could anyone who knows help me out?

I have a 2008 R52 Mini Cooper S JCW. It has the R98 web-spoke alloys on it.

I want to fit an R56 JCW Brembo Big brake kit to the car, but have been told I will need spacers.
Some people are telling me 5mm, other 15mm and some people 20-25mm!

Does anyone know? Is there any way of finding this information out?

Unfortunately I dont live near any tuners, so I would need to order the right spacers, get them delivered and have the brakes fit locally.

Thank you for any help