fitting interlock on zanussi aquacycle 1200?

hi there, i think i have diagnosed an interlock problem and have ordered the part, however i now have another problem there was an extra plastic part(which did not come with the spare interlock) see right of photo, that i was hoping to reuse. it holds a glass bullet shaped thing. unfortunately i have dropped this within the washing machine and i dont think i can retrieve it .
what was this part ?

http://img.photobucket.com/albums/v206/willowmoonn/ap50226735004.jpg