Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
Just tried to google Aquaclear quick filter attachment and all that is shown is the polishing insert which you don't want for the purpose stated.
Mine came with the black foam insert and I might have bought the replacement's at BigAl's online (can't remember).
PM me with address, and I will send you a spare I have lying around (no charge),
if you can't make or find something else.
I even have a couple of the fluval prefilter's you could try but the foam was not porous enough for my use.(Petco).