Right part

Hello! Our S380-29 does look close, but you may also have our S385-29 instead. I can't tell from these photos. The only difference between them is the size of the bottom shoe. You'll have to measure yours to confirm.

Please note that "28C USB" is not a part number. It only indicates the calibration of the spring (it would be our 2830 option) and should not otherwise be used to identify a replacement.