Its not in the most recent Riviera owners magazine but here's a thread on a new replacement system that was a bit less Rube Goldberg electrically if you're interested Charley:
http://forums.aaca.org/topic/216771-...now-available/ He offered a model that worked linked to the headlight switch and one with an override as well (I really liked that feature on my '65 Gran Sport I had briefly). I'd see if he's still making them, last mag I can find with it in there was just June '17
Also Steve Lorenzen (
[email protected], 502-817-8761) and Dick Sweeney (
[email protected], 619-806-3255) offers repair services on the motors. The linkages are typically what makes them get out of sync or sag.
I still suggest you join the ROA, lots of good stuff and resources even if the forum has it's curmudgeons.
Check out this modified Riv, also a ROA member:
http://www.hotrod.com/articles/john-...-andwhimsical/
(I'm not posting pictures as last time I did from Hot Rod, the image made the page formatting all off)