The rotor itself has a double bolt pattern (= 10 holes in total; I guess the other one's 5 x 4,75"), so it basically looks like this (without spacer obviously):
The interesting thing is, it perfectly mounts on the 71-72 spindle.
The only issue I have right now is one new noncircular Cragar wheel rubbing the lower a-arm. Luckily I have another one. I hope it's round.