^ what do you mean, have you already taken the bindings off?
As said above for the change of 1 size chances are you will be able to adjust them on the heel track to fit. If you have not got enough room to adjust you could just remount either the toe or the heel. This will be your best bet as you are only going up 1 size. If you remounted both heel and toe then the new holes would be about 5mm from the old holes which is not advisable.
If you have already taken the bindings off, just put them back on in the old holes with some binding glue and see if you can adjust them. Probably best to take them to your local shop though to make sure its all done right, and if you need a remount a shop will be your best bet anyway.