Some issues with my 2003 S60 AWD 2.5T

[N1ne]

Ok i have had a few problem with getting tires/rims to fit this car and it sees like it got that all set.The next problem i need to fix is 1 Breake booster and the break rotors/pads.Now the 1st things is i cant seem to get a straight answer if i have STS or DSTC.Now i have looked at the pictures online and there looks like to be be 2 connections on booster with i have and i dont have either bottons on dash board.My secound ? is what size breake front rotors are on this car 285mm or 305mm i have called my local Volvo dealer with both problems they are Zero help.