power steering pump seal blowing out....5 times now

i replaced the pitman shaft seal. put the washer and snap ring on and then the grease seal. started the car and had a leak. then did the same thing again with a new seal and that leaked . tried again with another seal and still the same. the 4th seal was the wrng part number. all these seals were in kits. the 5 time was another new seal......this time i left the washer and reataining clip out. the whole seal came out upon start up. so i put it back in and hammered it down. then put the washer and clip back in and got a leak. the washer when seated on the seal is 1/8th inch away from the clip.....on startup it was sitting on the clip so the seal had moved the washer the 1/8th inch. took the clip back out and started the car again.....the seal came out again.....there are press fit marks on the seal and it had to be pressed in with a mild force.........so...either everyone makes the wrong seal......or my housing is shot.....the box never leaked on the bottom....it leaked on the top (input shaft) so i replaced that and just decided to replace the bottom as well. i cant gt this thing to seal up....ive spent atleast $60 tring to get seals in this thing.....whats up here