Thank you, shwashwa.
As it turns out, these are the J99A.
I've been fiddling around and experimenting with my head's settings. The more I adjust the tone knobs on the amp and bass, the nicer tones I discover. I am liking these pickups.
So for the time being, I'll keep these pickups in place and experiment more with them on my own and when playing with the band. Maybe I'll eventually end up installing the DiMarzio DP123 Model J, in this B40.
Or maybe, some time down the road I'll get myself another B40 and install the DiMarzio DP123 Model J