Window channel

A quick learner from CA says:
Markings on part say

36 3 IQ Caldwell
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Bob from SWISCO responded:

This looks like either an S380-37 or S385-37. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need a stamp option of 3630.

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