I'm planning purchasing a MIM Fender Standard Jazz this week with the intent of gradually upgrading it. I noticed on the Seymour Duncan website that the bridge pickups for MIM and MIA are different sizes, so now I'm wondering what else is different? When I make upgrades, what else do I have to watch out for MIM vs MIA designed? For example, I'm also planning on putting a HiMass bridge on at some point, but would this change the string spacing? Would this affect the pickups I should be using? Thanks!