Those standard Peak 12 brakes run narrow (all of the Tyrolia 94-97mm brakes are optimistic). I have put them on 78mm skis (iM78 -- same as you?) before with no issues. So check them out when you get them, you may find that the fit is acceptable. The narrower brakes would need to be bent wider if you want to use them -- because the skis are wider than 78mm in the brake area where the width actually counts, and those brakes run a bit narrow too.
All Tyrolia brakes run narrow since fall of 2008 -- they really need to fix the manufacturing or revise their specs. I had to step up to 130mm Tyrolia brakes for some 115mm skis. The 115mm brakes were not even close to 115mm, and would have required a ton of bending. The 130s fit perfect.
BTW, the Peak 12 black/gray/yellow scheme looks awesome on the older brown iM78 (08 model) if that's what you have. I rarely care about looks with equipment, but that was one match that really surprised me. The combo skis well, and I liked the lower lift on the Peak compared to the otherwise identical LD model. If you got the Peaks for $85 the other day, that's a steal.