Included 6 piston monoblock radial caliper and mount to fit rear of late model touring.

This is not a flimsy two piece caliper.  No need for differential bore to compensate for a flexible two piece caliper.  This is an American Suspension monoblock caliper.  The entire caliper is carved from a single billet of aerospace Aluminum.  The caliper is machined and assembled by hand in the USA.