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Your search for "12-1/4" x 3-3/8" 10k hydraulic brake" revealed the following:

4741-LR
Pair of 12-1/4" x 5" 12K 16K Right Electric Backing Plate Trailer Brake Rockwell (4741-LR)
$547.65
Brake Shoe & Lining Electric 10K Rockwell 12.25 x 3.5" Right & Left (4738-2-3)
Brake Shoe & Lining Electric 10K Rockwell 12.25 x 3.5" Right & Left (4738-2-3)
$190.08
Lippert 10,000# SHORT Hub/Drum 183537 12-1/4" x 3-3/8" LCI After 2020 10k 4” Cap (791399)
Lippert 10,000# SHORT Hub/Drum 183537 12-1/4" x 3-3/8" LCI After 2020 10k 4” Cap (791399)
$354.99
12.25" x4" Electric Brake Backing Plate Trailer Left Side 10K HD axle 9-27 Drum (023-438-00)
12.25" x4" Electric Brake Backing Plate Trailer Left Side 10K HD axle 9-27 Drum (023-438-00)
$460.99
Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 7200 lb axles (77M-1210)
Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 7200 lb axles (77M-1210)
$22.32
Dexter 15k Hydraulic Brake Backing Plate 12.25 x 5 Left Hand 7 Bolt Axle Trailer (K23-406-00)
Dexter 15k Hydraulic Brake Backing Plate 12.25 x 5 Left Hand 7 Bolt Axle Trailer (K23-406-00)
$523.30
Hex Flange Mounting Bolt 1.5" x 1/2"-13, 9K & 10K GD Drum Mounting Bolt (7-292x8)
Hex Flange Mounting Bolt 1.5" x 1/2"-13, 9K & 10K GD Drum Mounting Bolt (7-292x8)
$14.50
Kodiak 13" Disc Brake Kit 8-Lug 7,000 lb Dacromet Two-Wheel Set Cap Style Rotor (2/R-133-7-8-DDD-K)
Kodiak 13" Disc Brake Kit 8-Lug 7,000 lb Dacromet Two-Wheel Set Cap Style Rotor (2/R-133-7-8-DDD-K)
$474.99
Crossover Brake Line, 8k caliper, yoke with notch (071-518-00)
Crossover Brake Line, 8k caliper, yoke with notch (071-518-00)
$27.99
Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 8000 lb axles (77M-1210)
Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 8000 lb axles (77M-1210)
$22.32
9k & 10K GD Backing Plate Hardware Kit, ONE Bolt, ONE Nut, ONE Washer (BRHK10K)
9k & 10K GD Backing Plate Hardware Kit, ONE Bolt, ONE Nut, ONE Washer (BRHK10K)
$1.77
Electric Brake Magnet for 12-1/4" Dexter & Universal 8K-15K Axles (77M-1210)
Electric Brake Magnet for 12-1/4" Dexter & Universal 8K-15K Axles (77M-1210)
$22.99