What length studs do I need?

[infanterene]

I want to install a set of bbs rs001 15x7 et25 on my 1991 318is. I’d like to use 10-15 mm spacers. What length studs do I need, to be able to use the spacers and still be able to install the center caps?

[Accomplish]

also wondering for the same exact set up..What size tires are you running?

[infanterene]

I am running 205/50 Dunlap Direzza z3. I don’t daily drive my car, I only use it for fun. I would not use those tires for dialy driving.