From the Ruger on-line store, as gunman suggested...
9mm Blued Steel - Magazine - 10-Shot
P89 (Serial No. 304-70000 & Above), P93, P94, P95, PC9 - 10-Shot, 9 mm Magazine - Blued Steel
Catalog No. 90088 - $37.35 each
P85 Pistol Stainless - Magazine - 10-Shot
P85,P85 MKII (Serial No. 304-69999 & Below) - 10-Shot, 9 mm Magazine
Catalog No. 90052 - $37.35 each
I hope this helps.