Performance online disc brake conversion kit

Standard would have been 9”. But there were option packages that would have triggered the 10” brake option. Or they could have just been an upgrade. If they were factory they should be on your build sheet or fender tag if you have either of those.

This is what my fender tag reads-
R11 V5X Y05 EN2
EB3 A04 A21 G33 H51 M21
EB3 D2B7 EB7 113 044671
E24 D31 VL29 COB 235369