The Golf MK5 is the successor to the Mk4 ranging from 2003 thru the first half of 2009 although it was only made available in the United States from 2006-2009. This generation GTI offered a 2.0L Turbocharged inline 4 engine which offered more power considering the previous MK4 1.8T engine.
Also re-introduced to the VW community was the VR6 engine into the MK5 R32 as well as the delighted Rabbit which equipped the standard 2.5L inline 5 engine.
You may find several parts with the MK5 are interchangeable but please verify fitment prior to purchase. I will also offer as much insight as possible.
Parts will be added soon over the next couple of weeks.