GJC

OK, sorry for the long delay in replying but life got in the way as usual...
So all 6 changed and I can confirm no pistons hit any glow plugs... 🙂

Was actually very straight forward, soaked them over night in Ludwig Rust Remover and carefully removed them with a setting of 20 Newton/M on the torque wrench ( all loosened with less - surprised as the motor has 333,333km on it and these have never been changed since I have had it from 90,000km ) after blowing out and vacuuming all the crap out ( mainly crumbling rubber sockets ).

I could reach all 6 without a flexible connection after removing the swirl flap motors ( 3 set screws to each ). What was very useful was a short length of plastic hose that snuggly fitted the end connector ( 4mm inner diameter ) to remove and place the new ones - it had enough grip to start the new ones in their threads.

Faults cleared with OBDeleven and all good to go.

So to conclude - the extra 4mm didn't create a problem - the fitted length was 130mm ( pin 28mm ) and any of these on AutoDoc would have done.
Thanks for all the advise etc.