If you want to replace to the original style balance system, without wings, use SWISCO balance Series 351. The Series 351 is a block and tackle channel balance with
15-002 and
19-002 fittings attached.
You gave us the original stamped information in your first post:
29 3: Should measure 30" in length,
S351-30, choose stamp option 2930
29 1: Should measure 30" in length,
S351-30, choose stamp option 2910
27 2: Should measure 28" in lenght,
S351-28, choose stamp option 2720
16 1: Should measure 17" in length,
S351-17, choose stamp option 1610
10 1: Should measure 11" in length,
S351-11 (custom), you will need stamp 1010
If you find the lengths do not match up as above, let us know the length of the balance (exclude the fittings for this measure) and remove the window sash and place it on a scale to give us the weight of the window sash in pounds. If the lengths did not match up as above, the sash weight is needed to determine the proper stamp option.