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Paul from SWISCO responded:
October 9, 2019
Take a look at the diagram of the two bottom balance shoes for the Series 380 and Series 385. The depth between the two is a little different. You will need to measure the depth of your bottom shoe and compare it to both pieces to determine which one is the better match. As for the stampings, your part should have a stamping or marking. If it does not, then you will need to remove your sash, weigh it on a scale, and refer to the chart on the store page. 
Comparison of 15-004 and 15-005
Stamp Option Sash Weight Range 1510 4 to 6 lbs 1520 6 to 10 lbs 1530 10 to 12 lbs 1540 12 to 13 lbs 1550 13 to 17 lbs *This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate. |
