http://www.artigue.com/fiatcontent/microfilm/22-B.pdf
Lists every part number for everything in the FI system. You may be looking for parts that were not sold as individual units; i.e. the throttle body parts were generally sold along with the entire plenum top. However, some help:
The idle speed screw O-ring is 10mm OD and 6.5 ID. I can buy them at Ace Hardware near my house, they are in a big O-ring rack and won't deteriorate when exposed to fuel/ethanol.
Is the top picture of your throttle body with the accelerator removed? I can't tell which side that is, the TPS side? Look at the microfilm page 46, it shows the entire throttle linkage with all P/Ns.