There was a thread a while back regarding Porsche crest stickers - the old ones with the yellow background as opposed to the new gold 3-d type that everybody sells these days. Here's a source for them:
http://www.racewearhouse.com/
These guys travel the race circuit and were at Sebring. Very knowledgeable. The stickers are not listed on the website, but they've got them. 4 inch and 6 inch I think. He's also got lots of other old vintage stickers and patches (i.e. Weber carbs, Gulf, Shell, Martini Racing, etc.). -- Curt