Replacing the single contact base in the existing socket is cheap using the napa dual contact bases, i think I paid $1.50 each. After that its just wiring.
Take the old round single contact disc with you to napa, tell them you need one of the same size with two contacts and yer done. Then get a set of dual contact bulbs.
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
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