Anybody running 17" Cobra Bullit rims on a Duster

Sorry to bring this thread up again...But I just finished the suspension rebuild on my 68 Cuda...I have RMS tubular uppers and strut rods, and a 73+ disc brake kit, (with the 68-72 v8 k-frame) I tried to mount a 17x8 bullitt rim with 5.72 backspace, but of course, the rim hit the outer tie rod end...I guess I'm gonna have to take the rotors off, AGAIN, install longer 1/2-20 studs, and run a 3/8 or 10mm spacer....DAMMIT!!!

Where are you guys getting your 3/8" or 10mm wheel spacers? I can't find them on summit..