Originally Posted by shashankmittal

If you are using a spacer that bolts to the hub and the wheel bolts to the spacer, then you don't need to worry, the spacer comes with lugs that you would use to install it.

If you have a spacer that uses the wheel's longer lugs to bolt to the hub, then you would need 14mm x 1.25 and shank should be at least 44mm. I am saying this because the stock lugs have a shank of 24mm, so if you sandwich a spacer between the wheel and hub, you need 20mm extra. Check this: Application Notes