all the bleed screw is,is a bolt with a fancy top and a groove down the side.just get a bolt(diy store) with the same thread and diameter and jobs a goodun.ive done this loads o times.the 5 turbos used to pop out and i started getting spares out of the scrappys but the bolt works
This may help...The plug in the hose nearest the rad is P\N 4407880 from Fiat and'll cost about 25p. The one nearest the back is a hose, P\N 46407694 and costs about £13...If its that one...I'd go for a screw personally! (No pun intended)