While perusing the junk at the junkyard, and looking for rubber plugs to block some un-used holes, I found the perfect one for blocking heater core pass thru holes. It came from a mid 80's Nissan Sentra....next time back I will try to nail down the year. I'm thinking the car didn't have A/C, but that they punch the holes in the firewall whether it has it or not...when it doesn't they use this block off.
It fits the holes in my 69 EB perfectly and looks good.
It fits the holes in my 69 EB perfectly and looks good.