The Flat-Base Mounting Bracket attaches to any flat surface. It is compatible with SA10, SA11, SA12 and SA20 MSG Swing Arms.
Flat Base Swing Arm Mounting Bracket
The Flat-Base Mounting Bracket attaches to any flat surface. It is compatible with SA10, SA11, SA12 and SA20 MSG Swing Arms.

MRZRD-4
SA9-011
RZR-025
TXT-110