Hello again

yesterday I got a call from a random car breaker I phoned months ago telling me they just got the part in!
Now baring in mind I phoned them in June about it, and they never got back to me. I'd completey forgotten about it.
Anyway they asked if I still wanted it and I said yes, so I now have the intake from a mark3 Golf.
Now it all looked pretty straight forward to fit, except once I'd taken the old air box off and positioned the new part, I realised that the 3 bolts poking out the top of the injector unit are too short
I guess I'll have to find somewhere that sells bolts and get some longer ones. It wasn't immediately obviouse how the bolts are to be removed. I'm guessing the bolts themselves have to be screwed out?
Also, there is a chunky black hose the comes out from the bottom of the air box. Could anyone tell me exactly what that hose does?
Thanks, and sorry for the long, belated reply :p