John : As I'm sure you saw, the 1967 Body Assembly shows this as 376357-S101. Of course, this does not appear in the Standard and Utility Parts Catalogs. However, in AMK's Guide to Ford Fasteners, they show it as SST, Self-Tapping, Oval Head Phillips, with a length of 3/8". As far as being SST, it may have been since it had an S101 finish, and an exterior application. Although, I have seen AMK listing SST quite a few times when the actual finish was unknown. Since S37 would be "normal" for an Exterior use Chrome Finish, it is possible that the S101 might be SST ?
Bob