i just pulled my 129's hydro due to the trunnion bracket in need of repair and leaks in a trunnion seal and the pump shaft rear seal. i went ahead and replace the other two seals while i had it apart. both the front and rear hydro pump shaft seals are the same.
be sure you clean the charge pump housing and pump housing completely before removing the charge pump and splitting the case. also, take a few more minutes and disassemble the pump and motor cylinder blocks and clean them. the motor cylinder block on mine was clean but the pump cylinder was caked with sludge.
i purchaced the seals from NAPA.
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