Actually all the vent windows made are from Counterparts. Goodmark and all the other Sellers including us do not make them. The biggest complaint we have is that if not waxed often enough. The chrome rusts real fast. At least here on the coast. Maybe not in a dry climate. I personally like rebuilding them and rechroming.
We retail and wholesale everything needed to rebuild Vent windows even a quality rivet tool. See pics. Need the rivets we will sell you one or 1000

We are the least expensive in the USA for window parts