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Your search for "12.25x3.375 ALKO 8K Brake" revealed the following:

2- 6x5.5 Idler Hubs w/ 3500# Bearing Kits Replace Trailer Axle fits Dexter ALKO (846551-KITX2)
2- 6x5.5 Idler Hubs w/ 3500# Bearing Kits Replace Trailer Axle fits Dexter ALKO (846551-KITX2)
$80.76
Trailer Bearing/Seal Kit 8 Lug 14125A / 25580 Bearing 2-1/8" ID Seal 5200K to 7K Axle Boat Trailer Pre 1999(BK3-200-10-10)
Trailer Bearing/Seal Kit 8 Lug 14125A / 25580 Bearing 2-1/8" ID Seal 5200K to 7K Axle Boat Trailer Pre 1999(BK3-200-10-10)
$25.99
Suspension Rebuild Kit for Single Trailer Axle with Wet Bolts and Bronze Bushings (SRK-SA-WB-BB)
Suspension Rebuild Kit for Single Trailer Axle with Wet Bolts and Bronze Bushings (SRK-SA-WB-BB)
$37.07
SP-20484-SQ-KITX2
2- Trailer Axle Square Spindle 3500 1-3/8 + 1-1/16 I.D. Bearing Dexter ALKO Axis (SP-20484-SQ-KITX2)
$105.09
UBOLT-5X9.5 · Round U-Bolt, 5″ × 9.50″ × 5/8-11 (Fits 12,000-lb AL-KO / Rockwell 12-86 heavy-duty round-axle assemblies)
UBOLT-5X9.5 · Round U-Bolt, 5″ × 9.50″ × 5/8-11 (Fits 12,000-lb AL-KO / Rockwell 12-86 heavy-duty round-axle assemblies)
$15.85
(BYOAK-84FZ-H545-R-LOOSE) LOOSE KITS - Build Your Own Axle Kit, 3500#,5 x 4.5 Hub, Round Flanged Spindle
$145.99
Build Your Own Axle Kit, 5 x 5.5" Hubs, Square Spindles for 3500# (BYOAK-84-H555-2.0S)
Build Your Own Axle Kit, 5 x 5.5" Hubs, Square Spindles for 3500# (BYOAK-84-H555-2.0S)
$155.99
Tandem Axle Trailer Suspension Rebuild Kit Long Equalizers Brass Wet Bolt 3.125 (SRK-TA-WB-LE-3125-BB)
Tandem Axle Trailer Suspension Rebuild Kit Long Equalizers Brass Wet Bolt 3.125 (SRK-TA-WB-LE-3125-BB)
$98.43
Suspension Rebuild Kit Tandem Axle Trailer Leaf Spring 3500-7000 EQ-356 and 3.125 (SRK-TA-SB-356E-3125)
Suspension Rebuild Kit Tandem Axle Trailer Leaf Spring 3500-7000 EQ-356 and 3.125 (SRK-TA-SB-356E-3125)
$55.99
Build Your Own Axle Kit 3500# Round Spindles, 6 x 5.5 Hub (BYOAK-84-H655-R)
Build Your Own Axle Kit 3500# Round Spindles, 6 x 5.5 Hub (BYOAK-84-H655-R)
$249.99
Build Your Own Tandem Axle Trailer Suspension Rebuild Kit 7K-14K Repair EQ-E1 (SRK-TA-SB-E1-3125-BB)
Build Your Own Tandem Axle Trailer Suspension Rebuild Kit 7K-14K Repair EQ-E1 (SRK-TA-SB-E1-3125-BB)
$84.99
Suspension Tandem Axle Rebuild Kit Short Equalizers, 3.125 Shackle Straps (SRK-TA-SB-SE-3125)
Suspension Tandem Axle Rebuild Kit Short Equalizers, 3.125 Shackle Straps (SRK-TA-SB-SE-3125)
$55.99