The turn signal is different for the 55 & 56 models. Those years the steering wheel was flat and the turn signal knob and switch were designed accordingly. The 59 should match the 57.
"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."
1957 GMC 150
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