Hey Piers, welcome to the Stovebolt! One of my son's best friends just moved from the US to South Africa after living here about ten years. I think he is living in Durban.
I don't know with certainty the answer to your question. There is a big difference between the '58 cab and the '61 cab. Actually '58 and '59 are basically the same, and '60 through '63 are basically the same. The question is did that change in '60 affect the windshield.
I did take a few moments and look up the windshield for each with my favorite old truck vendor,
LMC Truck. I was surprised to find the same part number for both the '58 and the '61.
58 -- 38-9407-T WINDSHIELD GLASS-SHADED
61 -- 38-9407-T WINDSHIELD GLASS-SHADED
I'd feel better if someone else came along and confirmed that, but it appears they are the same.
And Merry Christmas to you too!
