Alright Mate,
I recently knocked the heater bypass valves on the head as the replacement I had went again! I bought a 1 metre of cheap hose, cut them to size and put them on. However, the connecting pipe that sticks out of the block had a larger diameter than any of the others. It took me bloody ages to get the hose over it and clip it up (boiling hot water and shear determination!)
Maybe worth looking at the original pipe to see whether one end has a larger diameter (it wouldn't surprise me) - I haven't looked and only just thought about it, as i'm curious aswell now!!
Lost lots of sweat, tears and skin trying to get them on!
My engine is only an 8V, but still had the large connection.