67/68 Fastback for parts

Since all '67-'68's use the same doors, I'd bet they use the same door jambs. Also, if by trunk corners you mean the rear trunk corners, I think they are the same as coupes also. You'd have better luck finding a coupe to get parts to swap onto your fastback.
 
Still looking. Jambs are the same. Trunk corners over tail lights are not like coupe or any other mustang. Unique to 67/68 only. Dynacorn does not make yet either. E-bay sucks. I just don't understand the rediculous prices for pieces of shet. If dynacorn releases there completely new 67 chassis I forsee the market for junk to plummet. But if Ford keeps being a pain in the ass that it has been over the Mustang name it may never even happen.
 
Still looking. Jambs are the same. Trunk corners over tail lights are not like coupe or any other mustang. Unique to 67/68 only. Dynacorn does not make yet either. E-bay sucks. I just don't understand the rediculous prices for pieces of shet. If dynacorn releases there completely new 67 chassis I forsee the market for junk to plummet. But if Ford keeps being a pain in the ass that it has been over the Mustang name it may never even happen.
 
I'm sorry. For trunk corners, do you mean the rear fender extensions?
Well, I have both sides of rear fender extensions (1 new and 1 used) and trunk drop offs (both new) for sale that I have for a '68 coupe...If you're interested.
 
I recently installed new rear trunk corners on my 67 fastback. Since FB rear corners were not available from any vender, I ended buying some for a coupe. I was told that this would work, and it did. Actually I think I bought two sets. Let me know if your interested in them.