P-5829-2 E-clip for drop target pin:
https://www.marcospecialties.com/pinball-parts/P-5829-2
S-739-229 pivot link pin for drop target reset:
https://www.marcospecialties.com/pinball-parts/S-739-229
Found them listed in the Bally 1979-1 parts catalog at Planetary Pinball. Those pins wear out all the time. Keep extras handy if you work on lots of Bally's.