I have Moser axles and the green bearingsd also.
Just received my rear Aeorspace race brakes.
I talked to aerospace and was told if the studs are long enough to go ahead and use both retainers, Aerospace aluminum first the the Moser one. If the studs are not long enough then i will need to cut the Moser retainer off.
I measured the stud length and it looks to be long enough, in either case the Aerospace braket becomes the bearing retainer.
Ed