distance

Hi, I'm thinking of swaping the pickups on my stage one 5. After reading a lot of opinions and reviews I've decided to go with SD basslines. There's one thing I'm not sure though, I've seen the dimmensions on SD's site and they fit but the distance between the bolts doesn't match. Could that be...

May be a „cheap trick“ but helps checking the distance between frets and strings: Of course you can use an old ruler left from school. But however the zero is not where it should. Additionally this is no an exact method, especially after heavy gigs :? My proposal is to use on of those...