Wondow balancer needer

A contractor from Richmond va says:
I am in search of window balancers for these windows. 1810 and 2620 are the numbers stamped on them. I need 10 of the 1810 and 6 of the 2620. Can you help
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A contractor from Richmond. Va says:
Here are the photos for reference number D183372. I need
1810 balancer x10 and 2620 x 6
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Bob from SWISCO responded:

I too am sure we can help, but those stamp codes only tell us the strength of the spring inside the balance. To know its identity, we need the see the nylon fittings on either end of the metal channels. This will tell us what balance Series you need. 

A contractor from Richmond va says:

I sent updated photos to reference 

 I need 1810 balancer x10 and 2620 x 6 

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Tom from SWISCO responded:

Bob's not here, but I will do my best to help. Can you just confirm that the balance you're showing us is totally whole and undamaged? I want to make sure that nothing is missing from those nylon fittings that  may be important for identification.

Assuming that those nylon fittings are undamaged, then I recommend the Series 371 channel balance. Look it over and see what you think.

A contractor from Richmond va says:
Yes those are undamagaed
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