Where would I be able to buy a kit (if one exists) to adapt Audi A4/A6 door handles to my VW MKIV GTI? Or is it done by getting used handles from a car a a junk yard? I know it can be done. Here is the picture that inspired me to find out more!

both ways are possible.... i think JOM (among others) have the kits

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Mike, you can get door handle kits from Tuning Zubehor.

http://tuningzubehor.com/cfb.asp?pg...3&veh=290&cso=0

Polished aluminium
http://tuningzubehor.com/cfb.asp?pg...3&veh=290&cso=0

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1999 Audi A6 quattro
1990 Volkswagen Golf CL Syncro
1987 Audi Coupe quattro

Man, those wheels are sweet!!