my auldey phoenix came stock with this bearing but im not sure wheter it is a real konkave since it doesnt fit in my protostar or my duncan freehand.
first of all its not the size of a protostar niether the freehand and
second where did u get the phoenix ;D 
Freehand and protostars have to different sized bearings. Personally I really don’t know.
Looking at the tarnish on the bearing, it looks to be a bootlegged konkave bearing. Also, konkave bearings come in different sizes, not just C sized bearings.
Also, I’m assuming that it is a bootleg due to Auldey’s reputation.
I think Auldey uses an unusual sized bearing.