Steel casement window parts suppliers???

OK, I either broke the sucker when I ran into the open window (w/ my head, no less :)) while it was open last time I mowed (it's a moderately long story so I'll leave it at that :) ) or it just failed when I did go to close it which wouldn't be terribly surprising as they're at least 50 years old.
So, finally to the question--I did find a couple of online sources of supply (couldn't find any in town, unfortunately) of matching-dimensions replacement openers but don't know of any of them. Anybody here have experience w/ one of these online vendors to recommend that are trustworthy?

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