Power steering box to spool valve O rings

Does anyone have a part number or size or vendor where I can get these 2 O rings? There were several terms on this, spool valve or metering valve on top of the PS box.

Any help would be great, I just need to replace these before I can fire up the engine with the belts on it!!

should be 3879919

I had a similar leak in my '64 Polara when I first got it and all I did was get a small selection of o-rings from the local NAPA store and tried them until I found one that worked. No part number, no big deal.

I bought a kit from oriellys that i looked up on there website to get the part number then called to see if they had it in stock and just picked it up. I needed a carb kit once and went to a bunch of popular auto parts stores and everyone said it wasn't available after trying to look it up, so i went home and looked on the internet to try and find one thru an online company, and after a while I ended up on a local parts store website that I had just visited in person and found the kit online then went back to the store (that didn't have the part) to pick up the carb kit.