Hi, have 3 Alenco doublehung tilt out windows. The glass is too heavy (we changed glass out years ago) and need new balancers that can sustain greater weight. The windows don't stay open they slowly sag back down. The label on balancer says 25C. Someone told us we need 25D or 25E. Attached are 5 pics. Can you please identify which part we need? Also the width on coil side is 5/8" and on side w/out coil is 1/2". The balancers are 25" long. Thanks,
Alex