Firewall/cowl grommet for the antenna lead?

[texjake]

Does anyone know where I can find the firewall/cowl grommet for the antenna lead? I have search all ends of the web; from near & far (LMC, Brothers, etc..) and I cannot for the life of me find one. I bought an assorted pack of grommet's from the local auto parts store but none of those worked. It's the one where the wire lead from the antenna feeds thru the firewall, not the gasket one that the antenna sits on the cowl. Please help.