1990 Kinco Balancers needed

A handy person from Jacksonville, FL says:
My 48" Kinco's were installed in 1990. The balancers are shot. 29 inch channel, no wings on either end. Stamped 2840E. 25 lb. no tilt sash. Photos attached. What do I need to order?
A customer submitted photo of channel balance attachments.
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Paul from SWISCO responded:
Thanks for posting! Please take a look at our S390-29 channel balance with a 2840 stamp option. Do you think this might work for you.
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