This is a mod I have on my list too.
The E90 and E92 seats have a larger/different fairing around the front base of the seat. It will either need to come off or be cut in order for the first aid box to fit. I looked at my boss's E93 and I think it's doable, but not a simple bolt-on.
There is a slim chance you will need to remove 52106958659 and 52106958660.