<VV> 66 AM Radio knob question

[RKAT]

The INNER knobs on my 66 AM radio, the one on the left has one  -knub-
sticking out of it as a sort of indicator. The one on the right is
smooth. I picked up a Corvair AM radio with a bunch of other parts, the
inner knobs on this one have (if I remember correctly) 3 knubs on it,
kinda star like.. Kinda hard to describe. Which ones would be correct?

 

Thanks!

 

Ron Tinkham

http://www.ronsjeepjunk.4t.com/

66 Corsa Convertible, 140, 4sp.