Glad to be of help.
FYI, the front sensors are different from the back, with no iron tab to corrode on the front ones. However, I replaced both of those several years ago when I was getting strange ABS behavior. I didn't have an ABS compatible scan tool back then, so I asked my transmission shop to read the code while it was there for other service and they pointed to one of the front sensors.
The front ones are mounted through a hole in the steering knuckle and I had to drive them out of those hole (destroying them in the process) to get them off. I believe the mounting screw was also a challenge to remove. I think the magnetic nature of these keeps rust from flaking of normally, and so you get some strange results when metal around these things corrodes.
I noticed similar stuff on the rear ones, but the holes they protrude thorough have a larger clearance, so it wasn't as hard to get them off.