i think what you're looking for is a # 195 bayonette type. that's generally the dash lites. look for XENON. they produce a much whiter light. put them in my dome lite and it was like day and nite (no pun intended) also i'll use them for my daytime lites.
i know autozone has them and i've seen them on ebay.
1972 350sl Red/Blk 117k
1988 420sel charcoal/Blk 140k
1987 420sel gold/tan 128k
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