I have not found the bulb yet, (I broke the old one during disassembly) but it is a 51 type, pg. 107 of the parts list, Part # 223889 (50.960) 6V .8 CP Mazda 51
The bulb base is just a cylindrical holder for the bulb. It has a pigtail wire going into it. When I tried to remove it from the housing to photograph it the solder joint broke so it gave me an excuse to take it apart and re-solder it and give you a better idea of the assembly. I have included shots of the part and its wiring. It inserts into the female part on your speedo housing and is held by the 3 tines.
Bob J.
Attach file:
high beam bulb holder-1.JPG (105.92 KB) high beam bulb holder-5.JPG (144.47 KB) high beam bulb holder-4.JPG (124.83 KB)
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