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I can't claim to know what the "right" bulb holder is for 289 originality, there are experts here on the forum that can tell you. But having bought many gauges to find the best/right ones, I found there were many styles of bulb holders.
There were of course the bulbs that fit in a hole in the back and bulbs that fit in a tube that protrdues from the back (both these for intenally lit gauges).
And there were a multitude of side window lit gauge bulb holders. One was a ring that encircled the gauge and had a formed tubular tang that held the bulb. One was a formed tubular tang which was held onto the back of the gauge by one of the attachment screws. One was a formed tubular tang which held one or two bulbs attached to a gauge next to it. One was a formed tubular tang attached (soldered, rivetted, screwed to the gauge case.
You could probably go to your local british car shop and ask to sort though their "old stuff" and find one you could attach.
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