The new Kyosho rear suspension hangers (UMW705+UMW706 for rear motor) with the eccentrics allow for a slightly narrower inner position than UMW511+UMW512 gives. The hangers also allow for a slightly wider inner position than the UMW514+UMW515 hangers. The eccentrics included with the hangers allow you to run a plethora of positions between the extremes.

I have not built a mid motor car using the new hangers for mid motor (UMW705+UMW707) but I assume the adjustment possibilities would be the same. - J. Kirkwood

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UMW705 Aluminum Rear Sus. Holder (RF/RB6)
Optional aluminum rear suspension holder for the Ultima RB6. Toe angle and track width can be adjusted different combinations of the included molded bushings. This part installs in front of the transmission, ahead of the rear suspension arms. For use in both rear and mid-motor configurations.

UMW706 Aluminum Rear Sus. Holder (RR-RWD/RB6)
Rear aluminum suspension holder for Ultima RB6. Toe angle and track width can be adjusted by changing the resin bushings. For rear motor configuration. For rear side of the suspension arms.

UMW707 Aluminum Rear Sus. Holder (RR-MID/RB6)
Rear aluminum suspension holder for Ultima RB6. Toe angle and track width can be adjusted by changing the resin bushings. For mid motor configuration. For rear side of the suspension arms.