Any one how they get the plastic pipe over the connection? is it a heat up job and the allow it to cool?

Basically just got a escort cossy rail and line and didnt realise they were plastic cover in rubber hose, thought they were just rubber, so now i need to somehow convert the end to 3dr items (if possible) sure it is with a bit of jiggery pokery.

so any suggestions welcome, and also anyone got 2 3dr fuel line pressure connectors as the escort ones are different