There are some good used
gear chandleries within rock throwing distance of you. Both North & South of the border. The catch being, that there's NO substitute for visiting them yourself, & looking at their wares. And doing so on a regular basis, as well as establishing a relationship with the staff.
Also, have you tried putting up some
Gear Wanted postings? You may
wind up
buying another whole Dorade & accessories, but for only $20. So it's worth a try.
And as stated already, fabricating one (or a few)
DIY style likely won't be that difficult. And may save you both time & $, vs. all of the travel, calls, & online time it'll take to find a replacement.
Ditto on fixing the one you have, & making it better than new. Via a bit of beefing up, & some new
paint. Unless, that is, UV has killed the plastic through embrittlement.
Either way, fix, or build one yourself, there are examples of similar projects having been conquered on the WEST System website, & plenty of other places.