AFAIK the badges are stuck on with double sided tape. Don't know about clips or anything but there is definitely holes for some stupid reason.
CrazyQuiffs (http://www.golfmk1.co.uk/) is awesome for parts from what I have heard... Also a friendly bloke. Got a lot of rare things like GTI trim and so on. His badges range from £18 to £22.50 and compared to quiet a few others I have seen, thats pretty cheap. He also has the side stripes you were looking for.
vwturbo.co.uk also has some awesome stuff, including things like reprinted warning stickers like tyre pressure and fuel stickers.
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