Randy or his Dad will fix you up with anything you need, just give them a call. My cr used a weld on post. But my KX500 I have a clamp on. Mine did come loose the first time without removing paint, but after removing the paint, mine has been tight for four years. If I were having a cronic looseness problem, I wouldnt think twice about changing to a weld on post. On my CR250, I drilled a hole all the way through the frame tube, then welded it on top and bottom, that way I had a "double shear" type of mount , that is very strong.
John