I have played a few Shadows but never owned one, but I have owned/own a few Jetglos. Interesting about the 1 1/2" nut Ricks, I have never come across one, that I recall (I don't think the ones I played were any different from other Ricks of the era); it would be interesting to check one out, given the opportunity.
Here is a photo of some cool basses from the confluence I did in 2005.
Photograph Copyright © Jeffrey P. Scott 2005 All rights reserved.