944 calipers on 951 aluminum arms, which rotors?

[yetibone]

...just like the subject says.



Are there any Porsche rotors that have a lesser diameter, with the same hub depth? I have rebuilt some ATE single-pot rear calipers from a '84 944 N/A that I want to use on my 1303, and I have some '86 951 rear control arms already installed to the chassis. Are there rotors available that would make this work?

If not, will these calipers fit the narrower 931 aluminum arms? I am thinking the ATE calipers came on 931's, but I'm not positive.