I just finished redesigning the radius rod bushings for the Honda and Acura's that us the stock 12mm radius rod. The new design allows you to adjust caster without using spacers or disassembling the unit. The mounting holes and the outer dimensions are the same as the old unit, but the bearing and sleeves are updated as well.

Your comments are appreciated.
http://www.sbmsinc.com/photos/radius_0.JPG

Thanks
Tom Blaney