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I run a 15"x8" weld on the back of my PBR brake car. I had 2 use a very thin spacer. It was the factory one to get it to clear the fins on the calipers.
I wouldn't run a spacer either until I thought about it.
If you think about it, the rotor (or drum) is technically a spacer. I'm not a fan of doing it but if I have to, I use ARP studs and the thin factory or billet spacer.
I have worked on many Panoz road race cars and was surprised to see spacers on them!