They SHOULD have had it, but the local one near me appears fairly useless. Even with pictures and the model number, he was still somewhat flummoxed. Was going to order it, but waiting 2 weeks for a $9 part seemed silly when Amazon can get me a 5 pack for $8 and it'll be here Tuesday. I may see if Home Depot has a washer similar enough to get me by for a couple days, gotta grab some lube to grease things up as well. Assume it's just a silicone based lubricant?
Next adventure is getting the stem to let go from the main body, didn't slide right out like in the video. Which is probably the obvious culprit with the stem not being nearly lubricated enough and binding up/not going all the way back down...