Need new parts

A home owner from Middletown DE says:
Tilt in window 31 inches long metal piece 5/8 wide I can't get tilt out foot out of track. I think thats 1 inch wide Stamped 30 HD on side. I want to order everything for contractor to install.
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Bob from SWISCO responded:

I believe this is an S751-31 Ribbed Channel Balance, stamped 30HD. Your pivot bars are no longer made; you might be able to adapt the 26-150 in their place, but I can't be certain. Let me know if you have any further questions. 

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