Not sure what these are as I never asked haha. I seen them and knew they were the ones I wanted. Had to shave 1/4" to 3/8" in spots on the frame to fit them but I love the way they are plenty out of the way and sit farther out from the motor for better plug access. I live in Vancouver Washington but here is a link to where I bought them. You could call and ask if need be.
http://lineupandsoundoff.com/
He has a C10 also so he will know what your talking about.