Passing down the tradition

My son and I spent some time playing w/ my old Lego collection today. As I was putting him to bed, I was reminded of a Lego set I saw in the store as a 12 year old and just WANTED. My dad encouraged me to save my money and after several months, I had the $50 necessary to buy that set.

Tonight, 18 years later... I rebuilt it using instructions I found online. I was surprised how many of the original pieces I actually still had. I got most of it built aside from the ailerons and the related linkages. I was missing too many of the small technic parts... I wonder if I can purchase just the pieces I'm missing somewhere in order to finish it off?