I don' know where you can get $9 six lug rotors. I do know where you can get six lug rotors, however. Rez Engineering has them (406-727-9267). There are a couple others that have them, can't think of them right at the moment. Or, you could have yours redrilled - it will probably cost the same either way (approx $50 apiece).
Are you sure that you have a 72 booster? a 67-72 booster should have a bracket that spaces it out and UP from the firewall. It should only bolt on by TWO bolts, not four.
[ 12-17-2001: Message edited by: Vaughn ]