what rotor with 951 calipers on late ali arms

[zen]

these are 944S arms. i believe a 944S ran NA calipers though didn't it? bolt spacing is the same for the 951 calipers (94mm) though. i am trying to determine which rotors i should run and if i will need to do any caliper spacing.

thought the '87 and up 951s ran the same arms and therefore 951 rotors for the late arms are probably the right answer, but i am out of time for more mistakes and hoping someone here can confirm.

any ideas?