Stamp on channel balance

A handy person from North Port, Florida says:
I need to order channel balances but my stamps don't match your options. Mine are as listed:
28d usb
28c usb

Thank you,
Scott
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Hey, Scott. I see you were looking at our S380-29 . Is that the balance you need? If so, a stamp of 28D typically corresponds to our 2840 option while 28C corresponds to our 2830. You may want to weigh your window sash just to be sure, though.
How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
VIDEO
WATCH >
How to Replace a Non-Tilt Channel Balance
How to Replace a Non-Tilt Channel Balance
VIDEO
WATCH >
How to Repair a Jammed Window
How to Repair a Jammed Window
VIDEO
WATCH >
How to replace a channel balance
How to replace a channel balance
GUIDE
READ >
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)
Current wait time is 4-7 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.