Smeg oven door problem. 900mm Freestanding Model# CSA19XLP?

I have a Smeg freestanding stove, gas top and electric oven. It's about 12 years old.I dismantled oven door to clean inside of glass. A small plastic spacer fell out and i'm not sure of the position where it sits. When I reassembled it, the top of door wasn't flush right across...the centre piece sticks out and it doesn't close. Does anyone have an assembly diagram which would show this? I contacted Smeg Australia and they don't have one.