…well, they’re rubbish.
I just got covered in crappy oily shite changing a distributor cap, then changing the bloody thing back. Why? Because the new one, from a minor specialist doesn’t *actually* fit. Or at least it fits, but the plug lead holes are the wrong shape, so the HT leads won’t actually stay in the flipping thing.
Having spent about 5 minutes trying to work out why they didn’t fit I realised that the holes were virtually V shaped; so I’ll have to take it back. How crap is that?