1951 ignition switch retainer/locknut?

[onthehunt]

Hi all,
I'm trying to help a customer with a '51 coupe find the retainer for his ignition switch - it's not the bezel on the dash, but the quarter turn fastener that secures the switch.


The problem is, neither of us knows what it should look like, and from what I've read there are as many as 3 variations?


Does anyone have photos? I may have one in my parts pile but I wouldn't recognize it. Thanks!