[Bushkill]

Thatpetplace has always had the most extensive list of replacement parts of the Etailers. Petsolutions, and Kens usually stock stuff like that too. In a pinch, I've usually gone to a craft store and bought one of the clear suction cups with a metal hook on the back to hang ornaments from. If you have a steady hand, you can drill a slightly under-sized hole in the part that the hook attaches to that doesn't go all the way through and just mash it onto the sponge filter pin. Shouldn't cost more than a buck. Trying to find one in a LFS may take more time driving and calling around than it's worth. Some stores will keep a box full of oddball stuff like that, but it's rare these days.