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This is an upgrade rear upright for the Tamiya TT01/TT01E. It has several advantages over the allow versions available from other rc brands.
1) More rear toe in = more traction and stability. 2.5 degrees of toe in is more than any other upright on the market
2) Revised pivot positions lower the rear roll centre and adds 1 deg of camber to improve grip and traction. The TT01 is notoriously loose at the rear. This part really improves that.
3) Works with the kit plastic driveshaft and cups. All the other alloy parts available require you to change to steel driveshaft
4) Works with the solid kit upper arms. Because the roll centre and camber are added by a revised lower pivot position, there is no need to expensively upgrade to adjustable to arms. Just fit these and away you go.
To fit you need to drill out the holes for the screw pins with a 3.1mm drill to clean them up, swap in the wheel bearings from the kit upright (1150 size) and simply fit in place of the kit item on the left side of the car. Only ever use with the right side version (available separately on my shop)