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Dear David,
Good p.m. and may this find You Well. I have a couple of spare Nissens rads. They came with the bushing and plug, in a plastic sleeve.
The opening in the radiator is about 3/4" (19mm) in diameter. I'd have thought there is a marine type drain plug, of that diameter.
If not, you might be able to do the following:
(a) go to a supply house serving chemistry labs and see if they have a black rubber stopper of the correct diameter, with a single hole in it
(b) get a stainless steel machine screw, slightly larger in diameter than the hole in the stopper
(c) put a washer at the end of the machine screw, where it protrudes from the interior end of the stopper; then put a toothed lock washer onto the end of the machine screw
(d) put a stainless hex nut at the end of the screw, and tighten to the point, that the stopper starts to bulge
(e) drill a hole through the end of the screw, and put stainless wire through the hole and wrap wire around the screw's end (keeps the nut and washer from working loose, falling-off, and getting loose in the cooling system)
(f) put the stopper into the radiator opening, and tighten the screw, until you can't tighten it any more. You might need to hold the stopper with a pliers, as you tighten the machine screw.
I'd get several of the stoppers, so you can experiment with cutting them down. The goal is use a stopper of a length, such that when the machine screw is tightened, it bulges the rubber just on the inside of the radiator casing. That will promote a tight fit.
Hope this helps.
Yours, faithfully,
Spook
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