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B90, I am almost certain, refers to it having a 90mm brake. So to fit an AKJJ you'll have to bend the brakes quite a bit.
Other than that, they're a solid binding. Bear in mind that the DIN range starts at 9 on them and while they'll be absolutely fine at 9 they're more geared towards skiers riding maybe 11 DIN up. If you're riding below 10 DIN I'd be inclined to recommend the FKS140/Pivot 14 instead.