Wiper / headlight knob question

[So.Cal.Super]

I'm trying to find out if the headlight and wiper knobs in our truck were a standard chevy knob. Meaning were they used in cars and trucks or just our trucks. I've been trying to track down some billet knobs that are the same size as stock. I know a few have been made by board members but i'm not having much luck searching the net. I thought maybe if another classic used the same knobs it would give me more options to search for.

Thanks!

[68gmsee]

I think what might be better is to get on some of the sights that are specifically for the same vintage cars and see if you can get pictures of the knobs used.
Even in our 67-72 years trucks there were some differences.