part is 28 inches but is marked 27c

A home owner from pleasant valley ny 12569 says:
please identify replacement part, cost and shipping for 3 replacement parts.
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Tom from SWISCO responded:

We can replace this balance for you, but it will have to be specially made. I will email you a special order link and price quote for 3 of them right now.

This is basically our Series 770, but with the screw-insert replaced with a rivet in the second hole. This will allow you to install it using our 19-030 clip, or you can just re-use your old clip if it's still in good condition.

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