Here are some shots of the throttle leaver clip ( same production # 3919006 for 67-68) that you requested. When you get your 68 AIM you will see clearly
how it is attached to the throttle lever.The picture of the throttle clip on Ricks 67 does not look like it is installed correctly. By the way, Ricks 67 is the same one that is in Musclecar Tech (Chevrolet Camaro 1967 to 1972). I will post some shots of the throttle lever & clip tomorrow which will bring up some questions about where the clip is supposed to be mounted. The 67-68 AIM says one thing but the actual parts say something different.
John I hope the pictures help, sorry I took so long to get started.