NLA (unless you score some used ones from the back of a RR Classic heater display).
With a drill and a file you can turn the hole where these go into a circle and then file 2 slots in that hole. This will allow you to use the more common bulb holder that won't break each time you remove it. (You'll have to change the terminals on the wires too (to larger ones)).
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I do not check PMs. Call or email if you need something.
ECR is not a parts source. We are not in the mail order business.