I've looked through the forums on here but haven't found info on a cover plate to put where the blower motor sticks through the firewall (non-A/C 72 A-body). Does anyone make or sell a cover plate to install? I'll be installing a heater box later but for now, I'm just looking to install a cover plate over the hole. Anybody have info on one of these for purchase? I know AR Engineering sells one but thought I would see if anyone on here knows of others. Thx!