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

BK-10KE-01
12-1/4x3-3/8" 9K 10K GD Electric Backing Plate 10000 Trailer Brake Left Side (BK-10KE-01)
$120.60
BK-10KE-02
12-1/4x3-3/8" 9K 10K Electric Backing Plate 10000 Trailer Brake Right fit dexter (BK-10KE-02)
$120.60
Rockwell Quality 10K Electric Trailer Brake RIGHT, 12-1/4" x 3-1/2" 5 Bolt 4738-R (77-1210RW-2)
Rockwell Quality 10K Electric Trailer Brake RIGHT, 12-1/4" x 3-1/2" 5 Bolt 4738-R (77-1210RW-2)
$97.29
PAIR 12-1/4x4" 10K HD Electric Backing Plate 10000 Trailer Brake For Dexter (BK-10KHDE-SET)
PAIR 12-1/4x4" 10K HD Electric Backing Plate 10000 Trailer Brake For Dexter (BK-10KHDE-SET)
$276.19
PAIR-Rockwell 10K Electric Trailer Brake 12-1/4" x 3-1/2" 5 Bolt 4738-L+R 10,000 (77-1210RW-PAIR)
PAIR-Rockwell 10K Electric Trailer Brake 12-1/4" x 3-1/2" 5 Bolt 4738-L+R 10,000 (77-1210RW-PAIR)
$225.34
Rockwell Quality 10K Electric Trailer Brake LEFT 12-1/4" x 3-1/2" 5 Bolt 4738-L (77-1210RW-1)
Rockwell Quality 10K Electric Trailer Brake LEFT 12-1/4" x 3-1/2" 5 Bolt 4738-L (77-1210RW-1)
$97.29
RIGHT- 12-1/4"x3-3/8 Genuine Dexter Electric Brake Backing Plate 10K GD Trailer (023-451-00)
RIGHT- 12-1/4"x3-3/8 Genuine Dexter Electric Brake Backing Plate 10K GD Trailer (023-451-00)
$369.99
Backing Plate Brake Electric 12-1/4 x 4 Self Adjusting Drivers Left Side 10000 HEAVY DUTY (BK-10HDE-01)
Backing Plate Brake Electric 12-1/4 x 4 Self Adjusting Drivers Left Side 10000 HEAVY DUTY (BK-10HDE-01)
$135.42
LEFT- 12-1/4"x3-3/8 Genuine Dexter Electric Brake Backing Plate 10K GD Trailer (023-450-00)
LEFT- 12-1/4"x3-3/8 Genuine Dexter Electric Brake Backing Plate 10K GD Trailer (023-450-00)
$369.99
BK-8KE-SET
Pair 12-1/4 x 3-3/8 8000 Electric Trailer Backing Plate Brake Fits Dexter 4 Bolt 8K Axle (BK-8KE-SET)
$236.41
4738-R
12-1/4" x 3-1/2" 10K Right Electric Backing Plate Trailer Brake Rockwell Quality (4738-R)
$266.59
Four 12-1/4x3-3/8" 10K GD Electric Backing Plate 10000# Trailer Brake Fit Dexter (BK-10KE-SET2)
Four 12-1/4x3-3/8" 10K GD Electric Backing Plate 10000# Trailer Brake Fit Dexter (BK-10KE-SET2)
$459.99