At least one problem with putting clamps on is that the metal attachment points are ridged, not flat, so there won't be good contact between the hose and the metal (plus there will be stress at the peaks). The hoses are also probably pretty old and dried out, and you may not get a good "squeeze" out of them without cracking. Finally, in order to get the clamps on, you'll have to take the hoses out, so you might as well replace them anyways.