Pulley spacer dimensions needed asap

[dbv8]

Seems ive lost the spacer that ensures the pulley on a serpentine V8 is pushed back properly.

I desperately need the dimensions if anyone has one to hand.
I might be able to have one machined up in the morning.

I guess the ID will be 35mm to clear the crank and maybe a 45mm OD, but not sure of the depth required.