Dolmar Tech guy:
I wish there were a few more like you out there. There are dealers who haven't a clue where to get parts for stuff for any number of reasons...including not wanting to bother with your old thing, or the manufacturer has had trouble finding a distributor that is healthy enough to stay afloat.
I have a roto-tiller that needs a couple oif things; I called the mfgr, and even they couldn't help me out. The original MFGr went belly up, and sold at auction. The buyer just wanted the buildings for warehouse space, selling off the brand name name and mfg fixtures for $1, plus a tight time limit to get the stuff moved.
In the rush, alot of stuff was lost, including records. They can't even tell me when it was made...
sigh....