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

One -12-1/4" Electric Brake Magnet 8K 10K-16000# ALKO Trailer Axle Replacement red (K71-863-00)
One -12-1/4" Electric Brake Magnet 8K 10K-16000# ALKO Trailer Axle Replacement red (K71-863-00)
$79.83
23-105-09+23-106-09
Dexter Pair 12x2, 9 hole (4 hole AND 5 hole) Backing Plate Trailer Axle Brake (23-105-09+23-106-09)
$321.92
K71-650-00
Dexter Electric Over Hydraulic Drum Brake Actuator 1000 PSI Pump Trailer Axle (K71-650-00)
$1,113.70
BD044-H
Brake Hub for Dexter 10K GD Trailer Axle Replaces 8-288-3 (9-44) & LCI Lippert (BD044-H)
$119.73
Replacement Trailer Hub ONLY 10k 395S Inner and 387A Outer Replaces Dexter 8-214-05 Fits 99-27 Heavy Duty Drum (88-214-05)
Replacement Trailer Hub ONLY 10k 395S Inner and 387A Outer Replaces Dexter 8-214-05 Fits 99-27 Heavy Duty Drum (88-214-05)
$214.35
Brake Magnet – Replaces Dexter 7.2K and 8K Hybrid – Black Wire with Springs and Clips (77M-1208HB)
Brake Magnet – Replaces Dexter 7.2K and 8K Hybrid – Black Wire with Springs and Clips (77M-1208HB)
$22.32
Hydraulic Brake 12K 12.25" x 5" Dexter 7 Bolt RIGHT Hand Trailer Backing Plate (K23-409-00)
Hydraulic Brake 12K 12.25" x 5" Dexter 7 Bolt RIGHT Hand Trailer Backing Plate (K23-409-00)
$458.88
Brake, Electric, 12K, Right and LEFT 12-1/4" x 5", 5 Hole, fits Rockwell, 12,000 lb (77-1212RW-PAIR)
Brake, Electric, 12K, Right and LEFT 12-1/4" x 5", 5 Hole, fits Rockwell, 12,000 lb (77-1212RW-PAIR)
$214.24
AL-KO Right Brake 12-1/4x3-1/2 Backing Plate 10K ALKO Trailer Electric Axle 7290 (023-529-00)
AL-KO Right Brake 12-1/4x3-1/2 Backing Plate 10K ALKO Trailer Electric Axle 7290 (023-529-00)
$409.40
DM5425
USA Demco Hydraulic Torsion Axle Brake Line Kit Tandem Trailer Drum/Disc Brakes (DM5425)
$226.99
Demco Hydraulic Brake Hose - 18-7/8" - Male/Female 3/16" Fittings (DM05982)
Demco Hydraulic Brake Hose - 18-7/8" - Male/Female 3/16" Fittings (DM05982)
$30.81
Pair Electric Brake 12-1/4" x 2-1/2" for 7.2K - 8K NARROW Self Adjusting Fits Dexter 7200 8000 (77-1208HB-PAIR)
Pair Electric Brake 12-1/4" x 2-1/2" for 7.2K - 8K NARROW Self Adjusting Fits Dexter 7200 8000 (77-1208HB-PAIR)
$335.00