Replying to Replacing FKS brakes

hey guys,
i recently snapped one of the brake arms off my race stock p12's (same thing as fks 120). I took them to my local shop (they're pretty knowledgeable) and they said they'd order me a new set. However, I've read that the brakes can only be replaced by taking the whole heel piece off and remounting. Is this true, or is there any way around it? i don't really want to remount my skis, because they're currently mounted in a spot that i really like. any advice would be great!