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The dome light bulb listed in my '78 owner's manual is a 561. I am assuming it would be the same for the '77, if you are talking about the truck listed in your sig.
Thank you so much...I will finally be able to see again after dark; I did order a LED one from Amazon but they are saying it is 2 weeks out for delivery so, in the meantime, I guess I need a OEM replacement incandescent..
and it worked fine...I thought I had a problem when I put the lamp in and it wouldn't shut off no mater what I did to the headlight switch...then dummy remembered to close the doors and, viola, it works like it should (been so long since I had a light I was confused)
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