Viking non tilt window series 8300

A contractor from Colorado Springs, CO says:
Balances for Viking non-tilt window series 8300. Balance length is 27inches. Stamp 2640 with BS1 underneath
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Bob from SWISCO responded:

Hello there. Looks like you have an S395-27 to me. Please compare. For a stamp option, choose 2640. Let me know if you have further questions. 

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