I didn't realize the bumper was different also. I do agree with you though, the '48 style is different, and that's part of what it's all about.
I bought a '48 Sub, and don't know if it worth fixing yet, or just a parts vehicle.
To be honest, in doing a search online, there are very few examples to be seen in a '48 GMC Suburban.
I guess you never answered my question, but with both your input, and my own thoughts, I'm influenced, and in agreement.
Thank you.