umm you need to have oversized adaptors to suit fat bars otherwise they will not fit into the 7/8 clamps. No fatbar will mount into standard pitbike clamps , they will only work with adaptors or if the clamps are made to fit the contour bar
not sure whether the pimpit's clamps are oversized or somehow the bars taper to 7/8 where they mount too the clamps but I'd throw the stock pimpit bars away in the bin before I rode the bike. I would not trust chinese fat bars , even the cheaper fatbars from the store are ****.