[JRTJH]

Probably the best way to be sure you have (or get) the correct replacement vent lids is to first make sure they are all the same type (often one or two will have been changed by a previous owner or even different types are installed by the manufacturer in the powered vs unpowered applications). Then if they are all the same, take one lid off and take it with you to the parts department so you're sure you get the correct ones. It's very confusing to get to the store and realize that they all look the same except for "that one" which you're sure isn't correct.... If you have your old one in hand, the decision goes much easier.