Channel balances do not fit.

A quick learner from Gainsville, FL says:
The four, S377-19 (1820) balances of my order do not fit my window sash. They do not engage into the sash and simply come out. My existing balances are 18 1/2" long (metal section only), but the ones I received are 19". I checked the website again and the 18" series only have the four-digit number of 1720 and not a 1820. What is the solution to this? Let me know. All the other balances I rec'd went in perfectly. Thank you
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Tom from SWISCO responded:
Your balance will have to be custom made to a 18-1/2" length. I'll send you a custom order link for four of these immediately, which includes a price quote.
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