Hallo,
schau mal hier: (hier klicken) Dort findet man vieles zum Thema VW Golf.
I think this will fit, but you must prepare you metall (crashbumper), i don't know how to explain, behind the bumper.
I have installed an Intercoole in my Polo 6NF its measurs are 530x270x80 mm. the cooler ist mounted in the front behinde the middel hole of the bumper.
forge does also sell an intercooler set that ist ready to install in your golf.
you can purchase it on http://www.mft-berlin.de
I hope i could help you a little bit.
cu
Steven
StevenW: Danke!! I understand perfectly.
But don't you think the intercooler I found is zu breit? What I have hear, maximum breit is 600 mm, so there must be something that is in the way...Hmm 
I can recommend the FMIC from Greddy, verry fine i think but not verry cheaply. 
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