These are steering bell cranks for the Ten4 4WD conversion for RC10's. This set has the steering input on the left hand side and can use the steering servo mounted in the stock location.
Information on ordering the Robinson Racing input/output shafts and pulleys for the Ten4 can be found here
Information on ordering the custom front and rear shock towers for the Ten4 can be found here
Information on ordering nose tubes and other hardware for the Ten4 can be found here
The development of the Ten4 project can be found here
Youtube video of the Ten4 taking a couple laps on an indoor clay track can be seen here