Your search for "1969 firebird vibration dampener brackets" revealed the following:
REAR BUMPER BRACKET SET, USED, 5 PCS, 69 FIREBIRD
Regular price $249.00Rear Bumper mounting Brackets set, 5 pieces, used originals FITS: 1969 FIREBIRD TRANS AM
BRAKE DISTRIB BLOCK BRACKET, 67-9 F-BODY, 70-2 NV
Regular price $40.00Brake Distrib Block,Bracket67-9F,70-2 Nv,
FRONT BUMPER LOWER BRACKET, LEFT, USED, 69 FIREBIRD
Regular price $60.00Front Bumper lower side, driver side, reinforcement bracket ,under headlight, used OE# 9795989 Fits: 1969 Pontiac Firebird
FRONT BUMPER BRACKET, RIGHT, TRIANGLE, USED, 69 FIREBIRD
Regular price $35.00Front Bumper Bracket, passenger side, used small,triangular shaped, upper,OE# 9795913 Fits: 1969 FIREBIRD
TEMP BRACKET, ON CASE, AC, 69 FB, BELCRANK SWIVEL, CAST# 18459
Regular price $80.00Temp Brkt, on case,ac,69Fbbelcrnk swivel,,cast#18459
TRANS CROSSMEMBER TRANS BRACKET, TH400, REPRO, 67-9 FB
Regular price $117.00Trans Crossmember,trans brktTH400 (repro), 67-9 Fb
FRONT BUMPER LOWER BRACKET ,LEFT NEW, 69 FIREBIRD
Regular price $65.00Front Bumper & headlight lower reinforcement Bracket, driver side, repro, Fits: 1969 Firebird
REAR BRAKE HOSE BRACKET, USED, MOUNTS ON 10 BOLT REAR END
Regular price $25.00Brake Hose Bracket,rear, used ,mount on 10 bolt rear end cover, OE 97974661969 Firebird
AC DRIER MOUNT BRACKET, L SHAPE 67- 69 FIREBIRD
Regular price $45.00Air Conditioning DRIER MOUNTING BRACKET, upside down L-SHAPED, round strap bolt to it. OE# 9789972 new repro FITS: 1967 1968...
AC BRACKET, UNDER COMPRESSOR, CAST IRON, 69 70 PONTIAC
Regular price $80.00Air Conditioning compressor mounting Bracket, mounts to head under compressor, cast iron OE# 9785787 FITS: 1969 1970 all Pontiac