Need the one for the 3/8 inch rod for the throttle position linkage.

Where can you buy these? couldn't find listed at speciality places like AMK fasteners or r/t specialities or on line at auto parts store. not sure if this is a specialized piece or something more generic.....

picture attached. the rod clip in the picture is the 1/4 inch one for the middle section of the TP linkage and i need the one for the terminal end at the TP arm.