Hehr doesn't sell directly to public which is why you got the cold shoulder.
There are other places that they do sell to like
THIS one (never tried it).
If the glass was broken you can lookup some home and business glass shops, they will check the glass color, measure and cut and send the glass out for tempering. Once they get it back can install the glass in the frame for you.
As far as the "operator" and torque tube parts goes, typically you can find generic aftermarket replacement parts at your local RV dealer parts departments which with a little adjustment may fit and work for you.
I did find a Hehr replacement parts website
HERE (once again, I have not tried them) they list operator, torque tube, linkages parts.