I've ordered one from Yo Dave Yodave Products - Home along with the trigger spring kit. It was out of stock so I haven't received it yet but it's made for the CZ .22.
MWerks for a top quality product.
Possum Hollow for a Delrin one rhat works splendidly.
Whichever you get, purchase on specific for your rifle. The "universal" ones will NOT fit as perfectly.