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.

TXT-130
SA9-011
RZR-1075
SA20-001