I have. I ran into the same problem with my '55 2nd, which had the same smaller lamps you have. The replacement lenses didn't fit. I ended up putting new lamps on, and changed from painted to stainless at the same time. I'm inclined to think in my case, the plant that built my truck (Baltimore) may have had an overstock of '54/'55 1rst tail lamps, and simply used them up before swapping to the proper '55 2nd assemblies. Other than the size, the lamps are virtually identical.
