People have done as NZScott said and others like myself removed the Plastic entirely and replace it with Hose. But, I thought others said to use 3/8 hose when you leave the plastic on the nipple.

However, descriptions are in the repair links.

The Trick is to heat the plastic with butane lighter just enough to soften it and they grab the unheated portion of the line and yank the plastic tube off.
Also remember if you heat the plastic tube the banjo also gets hot. you can use a pliers with tape on the jaws to hold the banjo part.

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84 300D, 82 Volvo 244Gl Diesel