Hi and welcome to the forum,
major probs :
1&2 Change the fuel filter
3. brake disc do you #3 here: RealOEM.COM * BMW E34 525i FRONT BRAKE-BRAKE DISC
If so you need to drill it out ive done this many times.
1. You might get lucky on ebay UK or Germany (DE)
2. Door trim clips or a new trim
3. New clips
4. New lense you dont have to buy the whole unit.
I would say you could virtually sort most things at the breakers yard you have found.
Good Luck Im sure you will get there in the end.
__________________ VELVET BLUE UK INDIVIDUAL , IM THE LAST
UNITED WE STAND DIVIDED WE FALL
I stepped in a plate of Pasta the other day - now I have to worry about my Carbonara footprint!