Standby Garth...i will do some homework for ya and see if i can work some magic with the branch i deal with. I will get back to you with results, or another source.Found them at the same place.
https://www.fastenal.com/products/details/0413663?term=O-ring&r=~|categoryl1:"603388 Hydraulics 9and Pneumatics"|~ ~|categoryl2:"603576 Flanges, Gaskets, and Rings"|~ ~|categoryl3:"603580 O-Rings"|~ ~|sattr06
Well, except they won't sell to me. Gotta wait until Tuesday and go through a local retailer.
But, that's OK! I soon will have a few spares now . . .
Scott