A few are close to "one of a kind." My Makita/Dolmar came with a 18" bar that takes full size 3/8" chain, .050" gauge with 66 drive links. That link count is a real oddity. No other bar on any other saw uses it that I know of. No big deal. I can just buy cheap 70 link chains for Stihl saws and shorten them. I've got a rivet-spinner here.
Never heard of such a problem with plastic Husqvarna Ranchers. Generic .325" chain pitch, tang thickness of .050" or .058" and 78 drive links what many call a 20" bar (that actually cuts 18"-19").