How long are the back Boxster wheel bolts?
 

How long are the standard Boxster wheel bolts on a 2001 in mm? I got 21 mm spacers to mount some 18 x 10 Carrera lightweights. The spacers came from Ernie's Alloys and he sent me 60 mm bolts, but those are too long and when I called him he said the 50 mm would be too short. What is the proper size of bolts to mount the 21 mm spacers? I assume I would just take the standard wheel bolts and add 21 mm to get the proper size, correct???

Thanks,

Mike

The same length as the front ones...