shaft seals upside down

I replaced my Jandy FLOPRO motor couple weeks ago and also replaced the shaft seal. None of the instructions or youtube vidoes make it absolutely clear which side of the both seal pieces connect to which pieces on  the impellor/housing. My pump leaked after about 4 weeks and when I took it apart the new seal was eating into the backplate so I had to buy a new backplate as well. Even the shaft appears to be surface damaged, it is not smooth anymore. My question is if I need a new shaft now as well or even another new pump? I am not absolutely sure that I installed the seal pieces upside down since both seal parts pretty much disintegrated, but I need absolute accurate descriptions or installation instructions to install the shaft seal the correct way. thx.