never heard of anyone buying one. but there is one listed on toyodiy:
04445A GASKET KIT, POWER STEERING GEAR(FOR RACK & PINION)
04445-10030 1 $143.52
04455 GASKET KIT, POWER STEERING CONTROL VALVE OVERHOLE
04455-10030 1 $143.76
should be able to order those parts from toyota if not discontinued.