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

Left 12-1/4 x 3-3/8 Electric Trailer Brake Fit Dexter 023-434-00 8K Axle (BK-8KE-01-KIT)
Left 12-1/4 x 3-3/8 Electric Trailer Brake Fit Dexter 023-434-00 8K Axle (BK-8KE-01-KIT)
$125.33
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
Brake, Electric, 12K, Right Hand, 12-1/4" x 5", 5 Hole, Rockwell, 12,000 lb, Fits Rockwell (77-1212RW-2)
Brake, Electric, 12K, Right Hand, 12-1/4" x 5", 5 Hole, Rockwell, 12,000 lb, Fits Rockwell (77-1212RW-2)
$125.68
Dexter-Compatible Electric Brake Kit — 12-1/4" × 5" — 12K–15K Axles — 4 Plates (BK-12KHDE-SET2)
Dexter-Compatible Electric Brake Kit — 12-1/4" × 5" — 12K–15K Axles — 4 Plates (BK-12KHDE-SET2)
$544.06
Brake, Electric, 12K, Left Hand, 12-1/4" x 5", 5 Hole, Rockwell, 12,000 lb, Fits Rockwell (77-1212RW-1)
Brake, Electric, 12K, Left Hand, 12-1/4" x 5", 5 Hole, Rockwell, 12,000 lb, Fits Rockwell (77-1212RW-1)
$125.68
M-Parts Brake Drum 10K & 13G Trailer Axle 12-1/4 x 3-3/8" After 2009 9-123 8-430 (RP9-123-01)
M-Parts Brake Drum 10K & 13G Trailer Axle 12-1/4 x 3-3/8" After 2009 9-123 8-430 (RP9-123-01)
$214.22
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
Electric Brake Assembly Right Hand 10 x 2-1/4 for 4,400 lb Axles New Style Flange (K23-479-00)
Electric Brake Assembly Right Hand 10 x 2-1/4 for 4,400 lb Axles New Style Flange (K23-479-00)
$205.75
12.25" x 5" Right Hand Electric Brake Assembly for 12K-15K Axles (BK-12KHDE-02)
12.25" x 5" Right Hand Electric Brake Assembly for 12K-15K Axles (BK-12KHDE-02)
$148.89
Dexter 12-1/4" x 4" Left Hand Shoe Set 10kHD Cast Plate Trailer Axle Brakes (K71-501-00)
Dexter 12-1/4" x 4" Left Hand Shoe Set 10kHD Cast Plate Trailer Axle Brakes (K71-501-00)
$149.14
12-1/4 Electric Trailer Brake Adjuster Cable Kit Left Side 8k-10k 12k 15k (K71-504-00)
12-1/4 Electric Trailer Brake Adjuster Cable Kit Left Side 8k-10k 12k 15k (K71-504-00)
$46.89
BD044-GD-KIT
Hub+Brake Drum Kit 12-1/4x3-3/8 fits Dexter 10K GD Trailer Axle 8-288-5 9-44 (BD044-GD-KIT)
$364.97