The lights with the arrow lens inserts in fact are not aftermarket add-ons, but the Dealer installed GM turn signals. Factory turn signals weren't available until '54, but dealer installed ones were. Check out the Accessory Installation Manual for more info.
-Tim
'51 Chevy 3104 w/'56 235, 848 Head, HEI Dizzy, Corvette Cam, Split Manifold and Dual Carter YF's
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