Im in need of the same on my TSI, do it all and forget it..
Mitsu. part # s
MD182295 Balance Shaft Belt
MD326059 Timing Belt
MD129355 Timing Belt Idler Pulley*
MD156604 Timing Belt Tensioner Pulley
MD115976 Balance Belt Tensioner
MD164533 Timing Belt Tensioner
MD972052 Water Pump
MB568898A/C Belt (4PK 940 - i.e., roughly 940mm long, I believe, can use 37.0" belt, maybe 36.5)
MD178430 Power Steering Belt (660)
MD186126 Alternator/Water Pump Belt (4PK 990, Old # MD137594, can use 38.5" belt) MD121986 MD156770
MD0066651G lower timing belt cover gaskets (the ones on the cover often dry out and break off)
MD376608 Crank Pulley A good idea if your car has high mileage
* Add a M10x22 bolt MF241281 and a lockwasher if you have a '90, as the newer idler pulley has a different center, requiring a much shorter bolt
id also stick with OEM Mitsu parts and far as the belts and tensioner.