To20 oil pump problem (self inflicted)

Hello everyone
I pulled a big bonehead move and now may have really given myself a problem
On my TO20
I needed to rebuild my oil pump.
so I did, order parts took apart old pump wait for the new rebuild kit to show up, it did.
everything went great putting it back together now the bad part
I got ahead of myself and didn't look at the manual and the relief valve I assumed was an updated spring retainer and the pressure washer (had no relief valve in the pump beforehand, probably why I assumed it was a new retainer and updated design..) so I installed it upside down and put the cotter pin in.
now the really bad part I tossed the old spring retainer and pressure washer assembly in the trash... I never do this but for some reason this time I did Sadly so my question is how do I replace these items? can I just stick a washer in its place? or is the pressure adjustment washer, Pump specific and the hole size is determined by the pressure needed?
Thank's Everyone

the parts I tossed in the garbage are#66 Washer,pressure adjusting part#15326A
and part
#67 retainer 760159M1
I hope that can help anyone help me, any more information I will be happy to add just ask

I have found the parts at a local shop http://mabiebros.com/
Just wanted to thank everyone that looked and tried to help

I had low to zero pressure on mine. So I pulled the oil pan and primed the pump suction line. Now pressure is steady 20 psi. I assume you have
it back together already.