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S351-37 37" Series 351 Channel Balance

I need 4 arms for this height, 37", I don't want to order the wrong ones and waste your or my time, so I used the part identifier. Thanks, John

I think the part I need is S351-37. I've attached photos just to make sure the ends are correct. My balance has 3630 stamped on it. Since you are out of stock for that weight, can I go up to the 3640 and be safe?

I am sending you photos of the channel balance I need. I will need a quantity of 4 with all plastic parts connected plus an additional 4 channel balance top winged and 1 balance clip attachment.

Can you please help me identify these balances so I can order more

I have two windows with balancers that need to be replaced. Both balancers are 33 inches long and I included serial numbers in the photos. The balancers I removed look similar other than the spring is larger in the balancer from the larger window.

What is the appropriate replacement part for 36402 balance 37" And 2020(v) balance at 21"

I have 4 separate windows that use these. The numbers on the backs are 3640, 3620, 2440 and they are missing from one large picture window shown above completely. The weight of the window sash is 24lbs. I'm not sure what series they are and several series you have appear very similar. Please advise ... (cont.)

metal channel is 37" in length. All plastic ends found crack and deteriorated. Imprints indicate 3640CF and 3640AE with the letters B.S.I. next to the numbers.

The number on the channel is 36DS for one window and the other window is 33DS the picture in the 351 series looks very close, just not sure of the weight

I have window balances that are stamped 37-9, these are 351 series. I need 20 of them for now, but you don't have them listed. I also found another balance that has only the stamp 38. The window sash is 40 1/2" wide. These ones are 351 series as well, just don't know what option these would be. I ... (cont.)