Cowl drain plug

Does anybody know where to get a cowl drain plug for a '68 Newport? Year One doesn't list one for a C body, but have some that look to be similar. Problem is that you have to buy it in the whole body plug kit, which I don't need. Anyone have one, or know of another one that is the same? I've got the engine compartment lookin' nice and spiffy, but that big hole there on the firewall is driving me crazy!:gah:
Author: Mopardik