how about the clue in the name of the picture
Bill
There are only so many parts visible in the picture, most of them are discernible by year or limited to a few years. The clue is obvious to those of us that have had this discussion in the past on components that were discontinued and replaced with a different component.
In the photo you provided showing the suburban, the giveaway for me was the extra hand hole close to the front door was added in 1949 and it appears to have the louvers on the drivers side cowl, so it is post 1948 and pre-1951
BTW: I could be wrong with the panel component, because it takes a little imagination and assumption on my part due to the size and quality of the picture.
