Per the Parts Place site (
www.thepartsplaceinc.com):
They do not list the core support bushings separately, but I believe that they are included in the kit... I would inquire to make sure that they are.
BODY MOUNT BUSHING KIT-ALL SHOULDERED RUBBER BUSHINGS AND BISCUITS FOR RUBBER POINT CHASSIS MOUNTS. HARDWARE SOLD SEPARATELY
HB2132Z - (1973 - 1977 GTO/LeMans) BODY BUSHING KIT (KIT IS MADE OUT OF RUBBER WITH STEEL SHELL INSERTS. TWO OF THEM ARE SOLID RUBBER PLUGS & THE TOP CAP BUSHINGS HAVE STEEL WASHERS MOLDED INTO THEM JUST LIKE FACTORY. THESE REPLACE ALL GM NUMBERS: 330942 (4), 457915 (12), 330955 (4), 377801 (2), 6271662 (2) & 330951 (4) - ALL BUSHINGS HAVE THE GM NUMBER ON THEM) - 28 PIECE KIT- $249.00
BODY MOUNT HARDWARE KIT-INCLUDES ATTACHING HARDWARE FOR OUR SUBFRAME BODY MOUNTING BISCUIT SET. KIT INCLUDES BOLTS AND WASHERS.
HB5361G - (1973 - 1977 GTO/LeMans) BODY MOUNT HARDWARE KIT - $29.00
Ames lists just core support bushings for '73-'77 A body and '75-'77 GP..however, they must be in development, since instead of a price, it says "inquire"...
PS445 -1975-1977 Core Support kit-GP ... INQUIRE.
S393 - 1973-1977 Core Support kit, A body... INQUIRE.
I will look to see if I have any new or used core support bushings left over from my projects.
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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