The 3 on the left cost me over $6 at the stealer, before I used them I took one down to the local bearing and seal store to match. The 25 on the right cost me $5.40. The sizes on the bag are ID , OD and thickness. Got me a lifetime supply
I bought a box of 550 of various sizes for about 5 bucks at a tool sale. I think there were about 25 that fit the drain plug. I'm good on o-rings for a while, myself.
-013 is the cross reference size for HD pn#11105. McMaster-Carr has pn#9452K57 which is a bag of 100 for $2.47 and it is a Buna-N o-ring which will work just fine. It is best to get a Viton o-ring and McMaster has pn#1201T24 which is a bag of 50 for $8.20 and these are the vitons.
The 3 on the left cost me over $6 at the stealer, before I used them I took one down to the local bearing and seal store to match. The 25 on the right cost me $5.40. The sizes on the bag are ID , OD and thickness. Got me a lifetime supply