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Indentify the Bases 

Typical screw bases are shown below. One lead-in wire is soldered to the center contact and the other soldered or welded to the upper rim of the base shell. Bases are made of brass or aluminum.
Find the base type which looks like the bulb you are searching for. Note the description and type it into the Order Abbreviation search alone or in combination with the Bulb designation you found in steps 1 and 2 to find your bulb.