Results for Oklahoma State, taken from the list at:
http://www.stwnewspress.com/features...nvited-to-join
Alpha Chi Omega: 56
Alpha Delta Pi: 73
Chi Omega: 56
Delta Delta Delta: 70
Gamma Phi Beta: 51
Kappa Alpha Theta: 58
Kappa Delta: 56
Kappa Kappa Gamma: 57
Phi Mu: 59
Pi Beta Phi: 56
Zeta Tau Alpha: 56
It didn't say what quota was, but from these numbers, I'd guess it was 56.
ETA: above, Football Fan said quota might have been 54, instead of 56, and that Delta Delta Delta may have gotten 72 new members instead of 70. My counting from the online list may have been a little off there.