[C10 - C90 Bill]

Picked up 2 Saginaw Overdrives today. Mostly apart in boxes. Going to have one installed on my 2-Ring Saginaw 4-Speed for my '72 C-10. But no Pull Knobs came with them. Wondering what the original Pull Knobs look like, wondering how hard it would be to find an original and wondering what would be a good replacement.

Also interested on any comments on them. I've been wanting an OD for a good while now, but I am still learning.

Thanks