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

Quality Rockwell 10,000 GD Hub Drum Kit 4.75 Pilot 12.25x3.5 Trailer Spindle #99 (99865-1P475AB-KIT)
Quality Rockwell 10,000 GD Hub Drum Kit 4.75 Pilot 12.25x3.5 Trailer Spindle #99 (99865-1P475AB-KIT)
$564.70
Hub/Rotor Zinc Aluminum Caliper STRAIGHT SPINDLE 4.2K DB35 Right Hand 5x4.5 (43199RU)
Hub/Rotor Zinc Aluminum Caliper STRAIGHT SPINDLE 4.2K DB35 Right Hand 5x4.5 (43199RU)
$627.61
Add Brakes to Your Trailer Basic Kit 3500 axle 5 x 5.5 Bolt Electric Drum (94555-B-IMP)
Add Brakes to Your Trailer Basic Kit 3500 axle 5 x 5.5 Bolt Electric Drum (94555-B-IMP)
$269.99
TA05-020
Electric Trailer Brake Controller Installation Wire Kit (TA05-020)
$44.76
Add Brakes to Your Trailer Complete Kit 3500 Axle 5 x 5 Axel Electric (94550-C-IMP)
Add Brakes to Your Trailer Complete Kit 3500 Axle 5 x 5 Axel Electric (94550-C-IMP)
$252.26
Build Your Own 3500 Electric Brake Trailer Axle Kit w/EZ Lube Spinde 5x4.75 Drum (BYOAK-84-D5475-2.0R)
Build Your Own 3500 Electric Brake Trailer Axle Kit w/EZ Lube Spinde 5x4.75 Drum (BYOAK-84-D5475-2.0R)
$299.99
Trailer Electric Brake Hub/Drum ALKO & Rockwell 10K HD #120 Spindle 4.88" Pilot (Fits ALKO Cast#8900, 8-491) (4.75" Pilot is #120865-1PA475A)(120865-1PA)
Trailer Electric Brake Hub/Drum ALKO & Rockwell 10K HD #120 Spindle 4.88" Pilot (Fits ALKO Cast#8900, 8-491) (4.75" Pilot is #120865-1PA475A)(120865-1PA)
$864.87 — Sold Out
Rockwell / Quality 10K Electric Brake Hub Drum Kit BLUE – #99 Spindle – 12.25" × 3.5" – 8-Lug (99865-1PAB-KIT)
Rockwell / Quality 10K Electric Brake Hub Drum Kit BLUE – #99 Spindle – 12.25" × 3.5" – 8-Lug (99865-1PAB-KIT)
$436.81 — Sold Out
Rockwell American 12-1/4 x 3-1/2 Brake Hub/Drum #99 Spindle 4.88 Pilot 10K Blue (99865-1PAB)
Rockwell American 12-1/4 x 3-1/2 Brake Hub/Drum #99 Spindle 4.88 Pilot 10K Blue (99865-1PAB)
$392.66 — Sold Out
3,500 lb Electric Trailer Brake Conversion Kit – 10" x 2.25" Brakes, 5 on 4.75 Hub Drums (945475-C-FSA-IMP)
3,500 lb Electric Trailer Brake Conversion Kit – 10" x 2.25" Brakes, 5 on 4.75 Hub Drums (945475-C-FSA-IMP)
$274.99 — Sold Out
Disc Brake 10K HD 12K Kit w/Mount Bracket Yoke ( 070-006-01-RP-YOKE-KIT)
Disc Brake 10K HD 12K Kit w/Mount Bracket Yoke ( 070-006-01-RP-YOKE-KIT)
$340.55 — Sold Out
K23-087-00+K23-086-00
USA Dexter 10" Electric Trailer Brake Assembly w/Parking Brake ONE PAIR 3.5K (K23-087-00+K23-086-00)
$254.95 — Sold Out