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Your search for "12-1/4" x 3-3/8" 10K Hydraulic Brake" revealed the following:

Quality Rockwell 10,000 GD Hub Drum 4.75 Pilot 12.25x3.5 Trailer Spindle #99 (99865-1P475AB)
Quality Rockwell 10,000 GD Hub Drum 4.75 Pilot 12.25x3.5 Trailer Spindle #99 (99865-1P475AB)
$521.17
Genuine Dexter 7 x 1-1/4" Electric Trailer Brake Assembly (Right Side Axle (023-048-00)
Genuine Dexter 7 x 1-1/4" Electric Trailer Brake Assembly (Right Side Axle (023-048-00)
$131.99
Right Hand 12" x 2" Dexter Never Adjust Electric Trailer Brake Backing Plate (023-459-00)
Right Hand 12" x 2" Dexter Never Adjust Electric Trailer Brake Backing Plate (023-459-00)
$145.69
912865-1 · Hub & Drum 12K Rockwell 12.25" x 5" 8 x 6.5 2 Piece 5/8" Stud
912865-1 · Hub & Drum 12K Rockwell 12.25" x 5" 8 x 6.5 2 Piece 5/8" Stud
$453.85
Brake Electric 7000# 12" x 2" Dexter 5 Bolt Right Hand Side (Passenger Side) (K23-181-00)
Brake Electric 7000# 12" x 2" Dexter 5 Bolt Right Hand Side (Passenger Side) (K23-181-00)
$139.58
12" x 3.5" Electric Trailer Brake – 8,000 lb – 4 Bolt – Right Hand (4739-R)
12" x 3.5" Electric Trailer Brake – 8,000 lb – 4 Bolt – Right Hand (4739-R)
$326.46
ONE - Genuine Dexter Replacement Seal Grease 9K 10K GD Axel 3.88" OD 2.875"ID (010-051-02)
ONE - Genuine Dexter Replacement Seal Grease 9K 10K GD Axel 3.88" OD 2.875"ID (010-051-02)
$26.99
Hub & Drum, 12K, Rockwell, 12.25" x 5", 8 x 6.5, 2 Piece, 5/8" Stud, 4.75" Pilot, Gray With Bearings and Cap (912865-1475-KIT)
Hub & Drum, 12K, Rockwell, 12.25" x 5", 8 x 6.5, 2 Piece, 5/8" Stud, 4.75" Pilot, Gray With Bearings and Cap (912865-1475-KIT)
$620.39
Oct-56
ONE Trailer Axle Dexter Oil Seal 10-56 Grease for 10K 12K 15K axles 3.125" I.D. O.D. (10-56)
$21.59
Left Side 8 Lug Drum + 12"x 2 Brakes Trailer 8x6.5" 6000 7000 Electric Shoes RV (92865-B-IMP-L)
Left Side 8 Lug Drum + 12"x 2 Brakes Trailer 8x6.5" 6000 7000 Electric Shoes RV (92865-B-IMP-L)
$179.95
Pair of 12"x 2" Genuine Dexter Trailer Electric Backing Plate Brake 5200 6000 (23-105-106-KIT)
Pair of 12"x 2" Genuine Dexter Trailer Electric Backing Plate Brake 5200 6000 (23-105-106-KIT)
$274.99
2 x Brake Kit 6x5.5 Drums 12" Backing Plates, 6000# Trailer Axle + FLANGES (92655-B-IMP-K1X2)
2 x Brake Kit 6x5.5 Drums 12" Backing Plates, 6000# Trailer Axle + FLANGES (92655-B-IMP-K1X2)
$617.76