I have a dual filament bulb looks like a 1157 or the old 1034 except the alignment tabs are not staggered they are both low on the bulb base there are no numbers on my existing bulbs PMOSSBERG40554.9828240741
My father-in-law had some accessory lights about 30 years ago that used bulbs of the type you describe. I’ve got a feeling that they maybe hard to find now. Would it be possible to change the sockets to use the staggerd tab bulb?
I found one of the old lights. The bulb # was1126. The base was marked ”top” to show which way to insert it in the socket, The # 6 was also stamped on it so it may be a 6 volt bulb. We changed the car these lights were on to 12 volts but that may have been after we removed the lights that used this bulb.Hope this is helpful.
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Paul Mossberg
Former Owner of a 1981 Classic Roadsters Ltd. Duchess (VW)
2005 Intermeccanica Roadster
If you own a TDr and are not in the Registry, please go to https://tdreplica.com/forums/topic/mg-td-replica-registry/ and register (you need to copy and paste the link)