Due to the fact that the '54 and '55 first series are relatively rare as far as windshield geometry is concerned (compared to split window cars and trucks) . . . the market for the right Fulton visor for these trucks is pretty stiff. They come up on ebay every few months and often go for $300 - $700 depending on condition. I saw one a while back NOS GMC in the box go for over $800. If the look is that important to you . . . better be prepared to dig deep into the wallet.
