You can't buy the Alfa fittings on their own and the genuine Alfa pipes cost the best part of £100 each.
Buying the alfa cooler ( known for rotting around the bottom corners ) means you will need to buy the alfa pipe as well.
Both these items are known to fail ( the most likely reason yours has been removed ) so buying either from the breakers is a risky fix.
Many Alfas have the under tray missing, it's not ideal but many carry on with no ill effects you just need to rust protect and grease everything a bit more often, but undertrays can be had for about £28 on E bay and whilst they aren't the originals they will protect the lower fittings adequately.
Last edited by Yorkshirekeith; 07-08-16 at 18:46.