GL Buses and Karmanns (where can I get more info!?)

[Juan]

Hi Everybody!
I´m newly registered to the forum, altough I saw lots of threads I wanted to know where i can get more info/pics/anything about GL Buses and Karmanns!!!
I´m the owner of a 1958 Kombi and a 1958 Karmann Ghia Coupe. Both cars are going under restoration.

What offset should I go for if I want to fit 17 x 7 wheels on a stock front and rear brake drums and suspension? I´m planning to redrill the drums to fit 205/40/17 tires all around on both my cars.
Would the offset be the same for my KG as for my Kombi?

I saw a site a few days ago with graphic charts showing a standard Beetle size fender with most wheels options (mahle Gas Burner, different widths Fuchs,etc.) but I can´t remeber how I got there... Can anybody help me? I think that was a german site...

Any help will be appreciated!
Feel free to emailme: vintagevw@datafull.com

Juan