Oversized is a bad idea
The size of the brake, the waist size of your ski, and the size of the ice crampon are all interrelated. Read carefully before ordering.
Garmont underestimated the popularity of the 70mm brake (??!) and anything larger requires the next larger crampon. Don't buy oversized.
Oversized parts will mean having a brake arm and a sharp crampon sticking way out of the sides of your skis. At least it would be mashing up your expensive boots. Worse, it could injure you.
Another discovery: Standard leashes are too short for my setup, I had to extend them by about 3 cm (an inch).