Exterior Mirror Trim Bolts and retaining shims.
Included per order:
(4) Bolts
(4) Shims
 
3D printed with resin similar to ABS for toughness and with a little flex to prevent wear .
Fits may require a little sanding of the retention blocks to fit snug and glue in.
 
Just clicks into place once the tabs are aligned up.
 
Please see posting on FB and CS forums for other details.