Factory optional mirrors

[RTHarvey]

I am wondering about outside mirrors for my 1967 C10 long stepside. From my limited research, it looks like there were several factory options available. Does anyone know what the various options looked like? Especially the "West Coast Sr." and "West Coast Jr." These were options D29 and D30 (I think?). Also curious about the "Swinging Arm" type (D32 maybe?). I have some external mirrors on the truck, which I am not wild about. Maybe in the long run they would go away, but not soon as that would leave holes. But, if it were to turn out that they were original factory type or dealer installed options, I might leave them. No mention of mirror options on the SPID. They do work well, even if not very attractive.