Bottom rad hose

I have a series 3 with a 2.5 na defender engine. The radiator is standard s3. I bought a new bottom rad hose but the end that goes onto the water pump is way too small. Anybody any ideas about what hose to use?

Had similar with 200tdi heater pipes and a smiths matrix. Either you can search the likes of ebay for something that will work or use water pump diameter hose with a rad outlet diameter hose insert where it pushes onto the rad......if you want to be really posh you could bond the insert inside but a clip around should do.