Last time I checked this, and I did check it, you COULDN'T order Slash sig pickups with 4 conductors. I even asked directly through the custom shop. Something about them being sig pickups and you cannot change the specs or construction of it because it would no longer be the sig pickups. Or at least you couldn't get the Slash logo on the baseplate. Unfortunately I can't remember if you could get "similar" (read: same) sounding pickups as the Slash ones without the baseplate.
In actually did some swapping with it. Put an A2 and an A5 in it in an effort to avoid buying another pup. Still wasn't what I was looking for. I understand that an unoriented mag will sound a bit different, but I'm at the end of my rope with this project and just want something that works.
Yes, with probably a little more A2 influence than A5. It's a great magnet. There's certainly PU's where an A5 is too bright and thin, and an A2 is too warm and rounded.