Yeah, I should have just posted the info for folks down the line. Sorry about that! They sell the stainless track too if anyone ever needs that.
Brookfield, CT 06804
Part number is SG-SPH-20. Price is $1.32 each.
Description: Shelf Support with Rubber Pad for SPH-1820.
I bought 6 and freight was more than parts cost since they had to ship from their West Coast warehouse.