Well I kind of answered my own question regarding the bump stop in here: https://www.goldwingfacts.com/forums/...k-rebuild.html
(missed this thread the first time I searched)
I guess now that I have a source, unless someone knows of one that will be a more direct fit, I will go ahead with the OEM rebuild. I need to figure out how to fully take apart the piston rod assembly now
I'd still like to hear some insight on the progressive shocks though!