I recently bought a 55 C-1-B to fix up with my son. I am looking at replacement side/back windows, but I am confused by the 1st/2nd series designation from the parts places. Based on the VIN, mine was actually built in 1954, so I assume that it is a 1st series, but I can't find any pictures that note the difference between the two.
This looks like the right thing, but says it is the 2nd series and later years version. From what I can tell, the later years had a more square vent. My theory is that the listing is just mislabeled, but wanted some feedback from someone who knew more.
Anyone have a suggestion? (I have emailed them as well, but I have had too many vendors tell me their products would work when they wouldn't, so I figured I would ask here as well)