block and tackle and pivot foot replacement

A home owner from St. Louis, Missouri says:
The block and tackle has a number of 2840. I cannot find any number on the pivot foot. I would need 8 of each.
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Tom from SWISCO responded:

We can supply a replacement for this balance, but it will have to be a custom order. This is a very old model that isn't made anymore but we can make something exactly like it using different parts in our inventory.

Before we go any further, I just had a few questions for you. To start, can you tell me the exact length of the metal channel? Can you also tell me the exact weight of the sash? 

Once I have that, I will email you a purchase link and price quote that you can use to add 8 balances to your cart. The shoe is sold separately under our 15-105; this will not be included in the purchase link I mentioned so don't forget to add these to your cart, too.

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