I have an Antiquity II in the neck and an SJAG-2 in the bridge. It sounds alright, but I think I wired the SJAG-2 in backwards because when I turn them both on I get some phase cancellation issues. I think they sound unique together, but they're two totally different sounding pickups. The AII is really mellow and jazzy, and the SJAG2 has a powerful strat-like vintage twang.
It's not a bad combo in my opinion.
Yes, the SD pickups fit the covers and the claws.