So I don't know if the bracket on my Tillerpilot will fit into that part. Need to see one in person.

Several sites have parts listed, but without a at least a picture, you don't know what you are getting. Just a generic "bracket" name doesn't help.

Sites that do have pics, don't show basic dimensions, so again... who knows.

Worst Marine lists a part... so I'll go into their store to see if they have it. Otherwise I am stuck with "order and return" until I find the right part.

At least you folks here and the Raymarine site have helped me to understand how it should mount. Also did some reading on fluxgate sensors, and gained some insight there too. Being level is a big thing.