replacement anderson balance

A quick learner says:
Windows are from 1972 wooden, old balance are marked E19 on left one. Measures 6 3/8 by 2 7/8 by 3/4 thick. Window opening is 48 inches.
Can you tell me which replacement i need, both left and right side.
User submitted a photo of a window balance.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Based on your stamp of "9 27," I recommend our 24-939 Andersen balance.
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