I believe that the oring numbers are somewhat universal. You need #12 (13/16" OD x 5/8" ID x 3/32" thickness). It was the same #12 for Ace and Home Depot. Ace was out of stock but they carry it. I got mine at Home Depot. The Danco line is the one they carry at my Home Depot and their (Danco's) part number is 96729. They may vary regionally.
As for finding the post again, I tried to put any relevant search criteria in the title to make it easier to find this post with a title only search.