i havent seen anything of the sort ofcourse i havent been looking
but it looks like a custom job
makeing a cover wouldnt be to difficult
about 4"x4" square of sheet metal with two bends one to slip under the rocker sill and the other for the screw to hold
or by the look of it if it come out from under the rocker sill you could just unscrew the sill and stuff it under as i guess the is room
but from the picture it doesnt look like it goes to anything in the cab in that area you could just pull them under the cab and have it connected under with out it being in the cab
. . . yea