I'd like to add some clarity- the 18912A antenna lead in grommet is not for the Squarebird, tho it does fit other Ford vehicles. 359451S is the bung shaped hard rubber grommet that goes on the left side of the firewall and carries the headlight, Power window, and engine harness connections. It is retained by a metal connector that clamps over it and is screwed to the firewall. 14608A is a soft rubber grommet that is on the Right side of the firewall. It carries the antenna lead, the wiper vacuum line and has an extra hole that can be used for the additional vacuum line (430), or the washer pump switch vacuum line. It has a slot around it that retains it in the firewall hole. I've seen some catalogs that confuse the left and right grommets.