Results of Junkyard adventure

[Bob Mansker <oscargum@datasync.com>]

Found 2 headlight assemblys for my 87 5KQ for $10.50 each (includes side
markers) WOW.
Was going to get a A/C Comp. but held off.....? 
The Audi I was getting parts off of had the same single lens headlight as my
87.  The wheels were 4 lug.
Looked like my 87 but didn't know the year & whether the A/C was the same.
My 87 has 5 lug 6 spoke (Quatttro)
Does a non-Quattro have 4 lug wheels??
How do you identify the Year of this Audi??
Is the A/C Comp. the same for what years on the 5K________________________?
Thanks,
Bob