Stainless steel crimp-on fender bridge / bracket for fenders between 35 and 65mm wide.

measurements in mm (width from cutouts / total width)
S 35 / 71
M 56 / 92
L 64 / 110
XL 67 / 116

L and XL are reinforced for added strength

To get proper fit some bending may be required.

This is typically mounted at the rear brake bridge.