Where do these 2 things go in my Yong Heng Compressor?

Hi all, i tore apart my compressor to fix an oil leak into the coolant, which seems that ive done correctly, but i havent completely put it together yet, and i left it in pieces for a while now, and i totally forgot where these 2 little seals/delrin things go! Any help would be greatly appreciated!
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OMG! I'm sorry but i have no answer, just don't use it till you figure out or contact factory for schematic diagram. I have a chinese brand pump Tu Xing i bought long ago but never use it because not long after Air Venturi came out with Nomad II pump so i got that instead and been using it. So now i have a brand new Tu Xing pump sit in garage unused with original box. I'm thinking to sell though.