Here's a picture of what you're looking at if it helps. This is a Mk 2 Capri but I'm pretty sure it's the same.
Thanks but it's definitely not that one. There is no hole in the end that protrudes from the housing, just a socket that the pushrod from the slave cylinder sits in. I'm pretty sure the end that I can't see, in the bell housing, is a Y. I'll talk to Burton about it in the morning.