Real Fender spare, promptly delivered.
Originally, the pickups on Jazz (and P) basses needed shielding- hence the cover, these days they are purely cosmetic, but imo they greatly add to the instruments looks. One word of caution- it wouldn't fit on my Modern Player bass because of the high mass bridge that these instruments come with, so be prepared to change the bridge (or file the existing one, if you have a destructive nature !)
I have a Squier Mustang Bass, and so I put it on there- looks absolutely great!
I'll be back for both a bridge and a bridge cover for my MP Jazz.