Channel Balance Sash Weight

A quick learner from Washington says:
Hi There,

I think I've identified my replacement channel balance for my aluminium mid 80's Milgard windows at the S385. The ones I a replacing have 2640 stamped as my sash weight code which is not an option with the S385. Which weight should I order?

Thanks
Nick
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Tom from SWISCO responded:

2640 is the weight code you need to order. This is an option for Series 385. You can find it on the S385-27 webpage.

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