Modifying a Squire Strat

[Slimboy Fat]

Hi, I'm modifying an old early 90's MIJ Strat. Serial N0XXXXX. So far I have changed the electrics to USA pickups and will be fitting some Shaller tuners and a new Graph-Tech(?)nut. My main issue is sourcing the correct trem for my guitar. I'm a bit lost on what to buy. Theres some great value options on ebay.com but I want to be sure I'm getting the right size/spec before I committ to ordering one from the States. The current trem is 6 screw vintage strat style and seems to have a 2 1/8" E to E string spacing with a measurement of 56mm between the centres of the outside pivot screws. Do I have to match the exact size or will a 2 1/16" or a 2 7/32" do the job etc etc? Should I go for a '57 trem, a '62 or 70's. If anyone can advise me I would really appreciate it!