I believe the chin spoiler was simply bolted on. By "side trim" I assume you mean the panels between the wheels under the doors. I believe they were held on by clips along the bottom, a pop rivet on either end, and double stick tape along the top. In addition, there was a strip of bright work that ran along the top. I have some original bright work (that needs some polishing and one needs a bit of straightening) if that interests you. I got replacement bright trim from r.d. enterprises and it came out nicely. IIRC, it is plastic with finishers on both ends.