Could not find spare parts. so I make my own.

Need 2 pcs. 
Middle hole 8.5mm.

Holes for 2 bearing (608rs) 22.1x7.5mm

0.3 layers, 100% infill

Printed with PLA bcs there is no more than 60C.  2 months after repair and still works well.

Print with 45°chamfer on top, so you dont need supports there.