Window spring ballasts

A handy person from Rio Oso, Ca 95674 says:
Could you help with parts identify?

Top (black part)---- I read it as 19-002
Bottom ---- I could not find any exact please help.

Stamped reads 28 3 EK Caldwell.

I measured the metal channel and it measured 29 not 28.

Weight of window is 19 pounds but I have others with exactly the same numbers but with a 28 2 number.

Could you also give me approximate lead time?

User submitted a photo of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting, Richard. Check out our 15-001 and 15-002 and tell me which is a better match to your hardware.
Alternate view of 15-002
A quick learner from Rio Oso, Ca 95674 says:
Thanks for the help. Finally getting my order in.
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)