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

10K Lippert Bearing kit with Spindle End Hardware and Oil Cap (BK4-287-LIPPERT+183772CAP)
10K Lippert Bearing kit with Spindle End Hardware and Oil Cap (BK4-287-LIPPERT+183772CAP)
$57.22
RUBBER PLUG for Oil Cap, ALKO 3.75 CAP10K to 16K FITS: 021-219-00 (085-017-00)
RUBBER PLUG for Oil Cap, ALKO 3.75 CAP10K to 16K FITS: 021-219-00 (085-017-00)
$8.99
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
8K Brake Hub/Drum Kit — Straight Spindle, 25580 Inner and Outer, Valcrum Cap (696104-KIT-VA)
8K Brake Hub/Drum Kit — Straight Spindle, 25580 Inner and Outer, Valcrum Cap (696104-KIT-VA)
$409.99
Hub & Drum, 12K, Rockwell, 12.25" x 5", 8 x 6.5, 2 Piece, 5/8" Stud, 4.75" Pilot, Gray With Bearings and Cap (912865-1475-KIT)
Hub & Drum, 12K, Rockwell, 12.25" x 5", 8 x 6.5, 2 Piece, 5/8" Stud, 4.75" Pilot, Gray With Bearings and Cap (912865-1475-KIT)
$620.39
18-3/8" Long Equalizer for 2-1/2" Wide Slipper Springs for 10k GD Tandem Triple (013-140-03)
18-3/8" Long Equalizer for 2-1/2" Wide Slipper Springs for 10k GD Tandem Triple (013-140-03)
$89.29
912865-1 · Hub & Drum 12K Rockwell 12.25" x 5" 8 x 6.5 2 Piece 5/8" Stud
912865-1 · Hub & Drum 12K Rockwell 12.25" x 5" 8 x 6.5 2 Piece 5/8" Stud
$453.85
Left Side 8 Lug Drum + 12"x 2 Brakes Trailer 8x6.5" 6000 7000 Electric Shoes RV (92865-B-IMP-L)
Left Side 8 Lug Drum + 12"x 2 Brakes Trailer 8x6.5" 6000 7000 Electric Shoes RV (92865-B-IMP-L)
$179.95
Genuine Dexter 7 x 1-1/4" Electric Trailer Brake Assembly (Right Side Axle (023-048-00)
Genuine Dexter 7 x 1-1/4" Electric Trailer Brake Assembly (Right Side Axle (023-048-00)
$131.99
Copy of 10K Lippert Bearing kit with Spindle End Hardware (BK4-287-LIPPERT)
Copy of 10K Lippert Bearing kit with Spindle End Hardware (BK4-287-LIPPERT)
$46.34
Pair of 8K 12.25" x 2.5" RIGHT+LEFT FSA Special Also Fits 7.2k Electric 4 Bolt D80N (K23-622-623-KIT)
Pair of 8K 12.25" x 2.5" RIGHT+LEFT FSA Special Also Fits 7.2k Electric 4 Bolt D80N (K23-622-623-KIT)
$829.22
Basic Kit 5 x 5 Drum 3500# 10" Electric Backing Plate Right Side Only Trailer (94550-B-IMP-R)
Basic Kit 5 x 5 Drum 3500# 10" Electric Backing Plate Right Side Only Trailer (94550-B-IMP-R)
$95.99