67-72 Frame ID? ( 1/2 ton, 2WD)

[KevinK7]

I've done a number of searches and summarized what I found. I am by no means the expert here, just trying to put a list together. If anyone has anything they can add, Confirm, or more importantly, correct, please let me know and I'll update.




Thanks for the replies thus far

I plan to go look at a couple SWB frames and wanted to have an idea up front what to look for in an attempt to ID the frames as to what years they are. Needless to say the first thing I'll look for is the partial VIN stamp, but other than that, WHAT ELSE is there to look for?

My plan" I currently have a '68 LongBed C10 that I plan to convert to SWB. I will be installing drop, disk spindles, lowering springs and converting to 5lug axles (4.75 pattern).

Questions:
1.) With the radiator support mounts, what specifically is different from 67 and 68, ..and 69-72?

2.) For a '68 C10, converting from LWB to SWB (noting I will be swapping out spindles) will all year frames (67-72) be equally compatible?

3.) I know the SWB wheelbase measurement is 115" (LWB is 127") but on a bare frame, where specifically would this be measured?

3.) Realizing limited pics, but based on the photos below, (I don't know the VIN# stamps yet), what year frames do you see? (Assuming both 6 lug)
Frame#1:


Frame#2: