p22 pickups

I received a pair of what I'm told are 53/10's (uncovered squabbins) from an early P22 electric, which have P22 on the white sticker. Is there a way to tell without the guitar it came from's serial no if they are 53/10's vs 57/08's? (The seller doesn't know the serial number of the original...

I'm highly interested in getting a PRSi with 53/10's but there seem to be several (relatively different) models/avenues along which they were offered. In your opinion, which of those is most desirable or best showcases the sonic beauty of the 53/10 pickups?

The piezo contact under my B string seems to have gone dead. All the others ring fine, but when I pluck the B, there's virtually no sound at all. Any advice or do I take it to a dealer?

I have a 2013 model P22 Wood Library, behind the pickups it is only written P22 but does someone know what they really are. As I searched it seems they might be 57/08 but there is no official info anywhere. Thanks guys.