Audi A6 C5 Glow plug wire harness brittle

[SynonymForTree]

Hi,

 

I was going to change my glow plugs tonight - first time doing this. I've taken off the first wires on the first plug and its come off OK but I noticed the plastic was a bit cracked, on the next one I've taken off part of the plastic has stayed on the plug. Is this just because they are brittle and old - I assume the wiring has never been changed and got weak - or is it something I've done wrong?

Anyway, wondering of my next best steps - can anyone recommend what parts to go for from here? I can't find an exact part match so far

[SynonymForTree]

I'm now thinking of finding a breaking AVG engine and taking them off that

 

Anyone know what these need to be rated too or done this ? 

[SynonymForTree]

I'm also considering gluing some plastic bits together... the electrical connector are fine, I think it just needs this to sit tightly on the glow plug

[Steve Q]

On a petrol they're known as the leads but not sure what they're called on a diesel. You should be able to source them new.