Rollison 2500 series Unique 24-D-40 Channels

A home owner from Windsor Mill, Md says:
October 1, 2018
We have Rollison 2500 series single hung windows. The channels on the side say Unique 24-D-40 and Unique balance 24 P. As you can see from the photos one broke. I read you should replace both. Do you sell replacement parts for these? There is another number 24D USB
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Tom from SWISCO responded:
October 3, 2018

Hi! I recognize this. Measure your bottom shoe to choose between two options. If you have the 1-1/8" shoe, choose S390-25 (2440). If you have the 1" shoe, choose S351-25 (2440).

Comparison of 15-001 & 15-002
Comparison of 15-001 & 15-002
25" Series 351 Channel Balance
25" Series 351 Channel Balance
S351-25
$10.77
25" Series 390 Channel Balance
25" Series 390 Channel Balance
S390-25
$10.55
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