these are 29" window rails, there are stamped with the number 2740

A home owner from Arvada, CO says:
I am in need of two of these 29" rails. Also need 1 of the plastic clip that screws into the window itself. Thanks, Andy
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Casey from SWISCO responded:

Hello,

Take a look at our S350-28 channel balance with a 2740 spring strength option. Just make sure you're only measuring the metal channel, not including the attachments, when you're measuring the length. 

As for your top sash guide, see our 18-008, and compare the dimensions to yours. Thank you!

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