Another Fender Tag question
The online decoders are full of bad information.
I'll take that a step farther & say they suck.
An option code for one make & model can mean something completely different on a different model in the same year.
Option codes can also have different meanings in different years.
Online decoders try to be a 'one size fits all' when one size does not fit all.
If there is not a specific decoder for your make, model & year, you can expect errors.
Errors can be human also, online decoders respond to the data put into them (illustrated above) H51 & M51 are both valid codes & are often mistaken.
(we are all human & we all make mistakes at times)