This is the front tensioner base for the Ten4 4WD conversion kit. It mounts to the left nose tube screw and is used with the "Ten4 Front Tensioner Shaft"
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