Dave Sr. from SWISCO responded:
October 28, 2014
It's very hard to say what you have without pictures. Those numbers are stamped on a lot of different parts. That said, you say the end bearing is metal and not the nylon type? That makes me think of our 39-365 and 39-366. Take a look and compare them to yours. If you are still not sure, send us a photo of your part and tell us its dimensions and we will help you find something better.
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Tom from SWISCO responded:
October 30, 2014
Most older style operators have squared bases, but the manufacturers has phased that design out in favor of rounded bases. It shouldn't affect the operation of the window.
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