two different sets of Balances and pivot shoes

A quick learner from 32137 says:
I have two sets of balances I am trying to repair. Both are 28 inches in length. One is stamped Unique27-D-40, the other white one is 28F and some symbols. My belief is both can be replaced with your series 770, one in a 28d and the other in 28f as the channel is 9/16"on both. My questions are 1, what is the matching pivot shoe you have. The one currently installed is 2" high, 1" wide and 1/2" deep. I don't see one from you with that dimension. 2) one pivot shoe hook is slightly different than yours as it is a more wedge shaped plastic. I doubt that makes a different with the right shoe but? 3) do they come in white? 4) The F weight has a longer spring but I assume that is for weight. Is yours the same?
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Paul from SWISCO responded:

Hello,

Unfortunately, the company that made your balance system, Unique Company, went out of business. We can offer a substitute to replace the balance and pivot shoe with our S795-29 tilt balance with a 15-194 T-lock shoe that is 1" wide by 1/2" thick. Keep in mind, you will have to purchase the 15-194 separately and swap it out with the shoe that comes attached to this balance by default, our 15-195

The balance is one inch longer than your original balance to make up not using your pivot shoe. The spring weight will be 29D for a sash weighing between 23-28 pounds. 29E will be for a sash weighing between 28-32 lbs and 29F will be for a sash weighing 32-36 lbs. 

A quick learner from 32137 says:
Are you sure I can use this inverted balance given the existing on is a spring on top model?
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Paul from SWISCO responded:

Yes, I am confident you can use this inverted balance system.

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