Couple of Disco 200Tdi in Defender parts questions...

My 1986 110 has a Disco 200Tdi in it. I need to buy a couple of parts but just have a few questions...

The fuel return pipe is leaking...there's a split on the pipe that goes from the pump to the no.1 cylinder, right up where it joins the banjo. It's hard plastic, and I've heard replacements are softer and last better. Do I have to renew the entire pipe assembly ERR3652 or is there scope to only do the split part?

Alternator belt and PAS belt look pretty knackered. Are these likely to be standard items or is the alternator belt shorter than standard as part of the conversion?

Thanks in advance!

You should be able to remove the old pipe from the fittings and buy a length of fuel pipe with the right size ID