Looks like someone followed the Plumbers Creed: "Do your best, and silastic the rest" .
The seal is handy, as the lid does not have much force behind it, and the leaking air can be chilly in winter (unless you have a Warmaride... then the passing water valve makes the air leak bloody hot in summer ).
Rubber is OK in a pinch, but some heavy sponge-rubber (offcuts from Clarke rubber) glued in place seem to do a better job.
Cheers,
Harv.
327 Chev EK wagon, original EK ute for Number 1 Daughter, an FB sedan meth monster project and a BB/MD grey motored FED.
A quick flip through the 20yr parts book shows the seal as 7401688 and its pictured as the same rounded end shape as the plenum vent 'door'. Checking a couple of spares here found evidence of some very old spongy type foam. You might even find something at the hardware shop for sealing doors with self adhesive backing about 1/2" wide.
If it’s like this one Greg, uses the outer two plenum vent screws at top. Can’t remember how it bolts to dash but mine didn’t have anything in between when I ratted it from a mates car in 1988.
FB ute fixer upper, EK van on rotisserie
getting my FB ute on the road
EK van on rotisserie
Try sink sealing tape. Bunnings sell it. Its the right size and has peel off sticker with adhesive on one side.
This is Bunnings ID number:
Tape - 4 Pack
I/N: 4920416
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If you get stuck I can try take a few pics under there of mine mate - bloody tight in there with heater so make sure EVERYTHING else done before you put it in