This may be too late if you are going to buy today.

The best thing is to go measure and see where you want them to sit. 1" = 25.4mm. Spacers are going to push them straight out so you can just measure and see.

IMO a 10mm would look good but I don't like wheels that stick out.

 

yeah I went 10/15mm thanks for the speedy responses and help! I will go lower as soon as I can.