Gauge light bulb spec?
I don't know why a 57 would NOT be a good number, they've been around for a very long time:
http://www.gelighting.com/na/busine...ry/catalogs/downloads/auto_08_index_specs.pdf
might be a better one:
http://genet.gelighting.com/LightProducts/images/t04/0000000/r00300v-1.pdf
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