-We recomend you replace both sides.
-Balancer # should be stamped on the old balancer otherwise use the balancer usage chart to find the correct part #.
-Balancer size is determined by window size and glass type/thickness.
**Caution: Jamb liners may get brittle over time and may break during removal. We would recomend ordering Jamb liners on unit heights 310 and smaller.**