In a postscript to my original post, a word of warning: I have had a bad experience with the ebay trader "alfaautoparts11"! I decided to have another go at saving money by buying another used sump, and after very carefully explaining which one I needed, this guy sent me the wrong one and has totally ignored every attempt I've made since at getting a refund. Unfortunately since I did the deal over the phone, rather than through ebay itself, I haven't got any comeback at all. I'm not too fussed about the money, just the fact that he's ripped me off. He was trading under another name on ebay, but that had a feedback score of something like 76% (for good reason) so he's back with a new name and a clean slate. Incidentally, if anyone wants a sump for an Alfa 147 1.6 (it's one like the one in the first picture above), please get in touch!