channel balance non tilt windows

A quick learner from Imperial mo says:
need to get 4 new ones the only markings on the balances is - B.S.I. 2930- they are 1/2"

Thanks
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Manuela from SWISCO responded:

Please have a look at our S351-30 channel balance. This comes complete with a 19-002 balance top and 15-002 bottom balance shoe. You will need to carefully compare your fittings with ours to confirm this will work. If so, then you can go with the 2930 option that supports a sash weight of 16-23 pounds.

A quick learner from Imperial mo says:
Thanks very much for your prompt response and help so i could purchase the correct channel balances
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Manuela from SWISCO responded:

You're very welcome. Glad we could help. 

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