At some scrapyards, they do take the cars apart themselves, then you just tell them want you want (they'll get confused when you're not using it for a car though...) and they'll (try to) fetch it. That's how it was at the scrapyard I went to today at least
Didn't really find anything nice though. Found an Opel Vectra HC (Bigmomma-style) but it was just a tad to big (about 19 cm wide) to fit into my case. All the others pretty much were to big or had the fins to tightly packed.