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

Brake Adjuster for 10" and 12" Electric Trailer Backing Plates (4-304)
Brake Adjuster for 10" and 12" Electric Trailer Backing Plates (4-304)
$8.49
12-1/4 x 3-3/8 LEFT 8K Hydraulic Backing Plate Trailer 4 Bolt 23-402 (77-1208H-1)
12-1/4 x 3-3/8 LEFT 8K Hydraulic Backing Plate Trailer 4 Bolt 23-402 (77-1208H-1)
$111.47
12.25" x 5" Brake Backing Plate Dexter Electric Trailer Right 12K 15K Axle (023-447-00)
12.25" x 5" Brake Backing Plate Dexter Electric Trailer Right 12K 15K Axle (023-447-00)
$486.29
Left Hydraulic Brake Backing Plate 12-1/4 x 4 fits Dexter K23-404-00 10KHD 9-27 (77-A023-404)
Left Hydraulic Brake Backing Plate 12-1/4 x 4 fits Dexter K23-404-00 10KHD 9-27 (77-A023-404)
$116.31
Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 10,000 lb axles (77M-1210)
Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 10,000 lb axles (77M-1210)
$22.32
BK-12E-01SA
Trailer Backing Plate Brake Electric 12" Aftermarket Self Adjust Left Hand 7000 (BK-12E-01SA)
$69.99
Pair (2) Brake Electric 7000# 12" x 2" Dexter 5 Bolt Right Hand Side & Left Hand Side (K23-180-181)
Pair (2) Brake Electric 7000# 12" x 2" Dexter 5 Bolt Right Hand Side & Left Hand Side (K23-180-181)
$242.88
12.25" x 5" Brake Backing Plate SelfAdjust Electric Trailer Left Side 15000 Cap (023-446-00)
12.25" x 5" Brake Backing Plate SelfAdjust Electric Trailer Left Side 15000 Cap (023-446-00)
$486.29
Complete Brake Kit 8 x 6.5 lug 9/16" Electric Brake 5200 6000 7000# Axle 12x2 (568183-B-IMP)
Complete Brake Kit 8 x 6.5 lug 9/16" Electric Brake 5200 6000 7000# Axle 12x2 (568183-B-IMP)
$362.99
Basic Kit 5 x 5 Drum 3500# 10" Electric Backing Plate Left Side Only Trailer (94550-B-IMP-L)
Basic Kit 5 x 5 Drum 3500# 10" Electric Backing Plate Left Side Only Trailer (94550-B-IMP-L)
$95.99
Brake Electric 7000# 12" x 2" Dexter 5 Bolt LEFT Hand Side (Driver Side) (K23-180-00)
Brake Electric 7000# 12" x 2" Dexter 5 Bolt LEFT Hand Side (Driver Side) (K23-180-00)
$139.58
K71-081-00
Wheel Cylinder Rebuild Kit- Hydraulic Brake 9K 10K 12K Dexter Trailer Axle (K71-081-00)
$79.81