Truth casement window operator

A home owner from Montana says:
On the final arm (silver in color) is stamped 20544. On the underside of the bent or angled arm that connects with the final arm is stamped 30636. On the long brass-colored arm that goes to the bottom of the window is stamped 30470LH. On the brass-colored half circle canopy that is at the base of the cranked shaft is stamped 30170.
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Bob from SWISCO responded:

This looks like our 39-031 & 39-032, just make sure the length of the link arm (or final arm) matches up. Let me know if anything differs. 

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