A couple of nights ago Matt decided to sell his old car on eBay by parts, because the parts did not quite fit in. Mostly he was interested in selling his engine.
Now, I had a car of exactly same make and my parts also did not fit together. So I told him: look, we got the same problem and can solve it if we work together as a team. He said, sure. I suggested that he buys my engine (same as his) as a starting point. This is a clear win-win. Matt looked at me suspiciously. He always does.