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

Left Hand Wheel Cylinder Assembly (9777)
Left Hand Wheel Cylinder Assembly (9777)
$46.50
BD044-D
Brake Drum 10,000 GD Trailer Axle 12.25x3.375 Replaces Dexter 9-44 & LCI Lippert (BD044-D)
$191.52
K71-650-00
Dexter Electric Over Hydraulic Drum Brake Actuator 1000 PSI Pump Trailer Axle (K71-650-00)
$1,113.70
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
23-438-439
Pair- 12.25" x 4" Brake Back Plate Trailer 10K HD Axle Dexter Electric 9-27 drum (23-438-439)
$817.40
Hydraulic Brake 12K 12.25" x 5" Dexter 7 Bolt LEFT Hand Trailer Backing Plate (K23-408-00)
Hydraulic Brake 12K 12.25" x 5" Dexter 7 Bolt LEFT Hand Trailer Backing Plate (K23-408-00)
$535.56
Hydraulic Brake Backing Plate Kit, 12.25" × 5", Self-Adjusting, 12K–16K Axles (Left & Right, 7-Bolt) — (77-1212H-KIT)
Hydraulic Brake Backing Plate Kit, 12.25" × 5", Self-Adjusting, 12K–16K Axles (Left & Right, 7-Bolt) — (77-1212H-KIT)
$280.49
10 K Hub/Drum for ALKO Trailer 10,000# Axle 568270 12.25"x3.5" 4.88" (99-86510-568270)
10 K Hub/Drum for ALKO Trailer 10,000# Axle 568270 12.25"x3.5" 4.88" (99-86510-568270)
$389.85
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
12"x2" Hydraulic Brake Backing Plate Brake Drivers Side Left Trailer 5 Bolt 5200#, 6000# 7000# (BPH-7000-LH)
12"x2" Hydraulic Brake Backing Plate Brake Drivers Side Left Trailer 5 Bolt 5200#, 6000# 7000# (BPH-7000-LH)
$75.99
Wheel Cylinder Push Rod, Duo Servo, 1.50" Bore, Fits 10K / 12K / 15K / 16K Hydraulic Drums, Replacement for 9550001/5783 (054-146-00)
Wheel Cylinder Push Rod, Duo Servo, 1.50" Bore, Fits 10K / 12K / 15K / 16K Hydraulic Drums, Replacement for 9550001/5783 (054-146-00)
$136.10
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