Hi Mike, you have a couple mm to play with so it would probably work, although not always. If the ski has a steep sidecut and you have big feet, the area where the crampon lays could be wider than 102.
As a ski tourist living in Southern Idaho I would NEVER leave my ski crampons at home.
Have plenty of time left my pals in the dust cursing when the skin track gets icy or conditions less than perfect. Heck, go to the Tetons and some of those tracks are so packed and steep it's like blue ice (I jest).
I don't hesitate to bust these out and forget about all the back sliding.
Hi Steven, 120mm is not ideal for those since there would be some overhang. The 100s should fit snugly as they are built with a couple extra mm to account for the sidecut change between the waist and the crampon area, which varies depending on you boot size. 110 would be an in-between fit.