The Hehr p/n is H109-376. It comes in both black and white so be sure your source will permit you to specify which.
I order Hehr parts from Pelland Enterprises pellandent.com (aka rvwindow.com). Great service.
Dates for Quartzsite 2020 are:
Big Tent RV Show - Jan 19-26
Fiberglass Rally - Feb 3-9
There’s information on the rally over on Fiberglass RV Forums:
http://www.fiberglassrv.com/forums/f57/2020-quartzsite-gathering-88194.html
We posed the same question about two years ago prior to picking up out unit and got TONS of responses. The danger is purchasing too much. I would need another TV and another bank account (with $$ in it) if we purchased everything recommended. Good luck and have fun.
Wow! Great stuff. I wonder why my search didn't turn that up. Thanks so much.
To anyone looking at my question -- disregard and do NOT pass GO, instead go directly to Overland's thread linked above.