The door bumpers are correct. GM still sells these new. The strikers are very important. OEM is the only way to go. The aftermarker striker bolts just don't work right. They have the allen head instead of the T-50 Torx.
The bushings, or silencers are GM 9601752
The complete striker is GM 9601750
The door bumpers are GM 20376243, replaced GM 4564974. List $1.53 each
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4
2019 Canyon SLT Crew 4X4
