the other day my girlfriends bro gave me a spare vxr turbo he had as mine has seen better days, my cars a z20let gsi. gonna look at fitting this next week and just wondered what i should be looking at to check that its in good working order before i put it on. i just wanna give it the once over before i put it on and haven't dealt with a turbo before really. having a look now the 2 parts between the turbines and the main housing seem a bit loose, the exhaust side looks abit oily but i'm not sure if thats where its been in storage for the last year. presuming them 2 bits shouldn't be loose how would i go about repairing it? i wanna try and get the turbo changed next week while i'm off so need to sort it asap, pics below

any help much appreciated