Well, first off, those are not yfz450r shocks. Those are just yfz450 shocks, big difference. Second, it depends on which a arms you have. The easiest way to tell is to lift the front of the bike up and take off your shocks. Let your a arms bottom out on the balljoints. Now measure the eye-to-eye measurement (lower shock mount center to upper shock mount center). Those shocks you have pictured should be around 16.25" eye-to-eye. If you don't have more than this, I would say at least a 16.5" bottom out measurement, then these shocks will damage your balljoints. If I remember correctly, these shocks wont fit on +2's, but it wont ever hurt to check the way I said.