I got new brake pads for my 04 cr125 and it says not to use the original shims or insulator.But I put the pads on without the insulator,because they wouldn't fit.They fit on the pads but couldn't slide both pads on.too thick.But i've put the pads on with the stock shims and it seems to be fine,but was just wondering if it would mess up the pad without the fiberglass piece (insulator).please help.....