Searching for my Balance block and tackle have a 2790U on them, do you have replacements

A quick learner says:

I'm going to need two sets of # 2790U do you have these?

My window is 30.4 lbs

Left balance BSI 2790U

RT BALANCE BSI 2740V. I would like to get a price quote parts and shipping and ETA on delivery

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Tom from SWISCO responded:

Hello! Your balance looks like a match for our S350-29 channel balance. This has a 19-002 top and 15-004 bottom nylon fitting, so as long as those match up then you should be good to go.

Based on your sash weight of 30.4 pounds, you can use our 2760 stamp option. Two balances with this stamp carry 30 through 33 pounds, so it should be perfect for your window. 

For future reference, note that both balances on any given window should have identical stamps. It sounds like someone put in the wrong replacement part at some point in the past.

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