new hardware to be install

A contractor from quebec, canada says:
As per discussion this morning with someone there, here is some pictures. ,let me know what product I need, I'll give you a mastercard number to order one for approval by architect, if product is approved I'll order around 70 kits. Probably series 200 will be ok . Pierre
User submitted photos of window hardware.
Profile picture of Paul
Paul from SWISCO responded:
Hello! For these old windows, we recommend our 5/8" diameter Series 500 spiral balance. We also recommend using a 17-012 bracket to attach it to the sash. This balance has been used on wood windows like this since the 40s and I find it to be very reliable.
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