Tim I use the #81 for the tail light and the #1129 for the brake light. The OEM bulbs in '38 were the #63 for both tail & brake in the car. The truck used the #87 for the brake light. The problem there is the #87 is only 15cp where the #1129 is 21cp. The #63 is only 3cp where the #81 is 6cp and the exact same size as the #63. The #1129 is the same size as the #87. Using a #81 and #1129 give a 6v vehicle brighter tail lights than a 12v #1157 and almost as bright stop lights. In the '38 two bulbs were used in the housing. For the years where two bulbs were used the upgrade is easy. I don't know when Chevy went to the single, dual filament bulb which would prevent that particular alteration. FWIW using a 316 bulb for your dash lights will make them much brighter.
Last edited by Tiny; 04/14/2017 6:02 PM.
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