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

Dexter FORTRESS 3.75" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-304-00)
Dexter FORTRESS 3.75" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-304-00)
$48.28
4 - Dexter FORTRESS 3.75" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-304-00-FOUR)
4 - Dexter FORTRESS 3.75" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-304-00-FOUR)
$168.00
2 - Dexter FORTRESS 3.5" Diameter Aluminum 21-88 Oil Cap for 9-10,000lb axles (K21-302-00-PAIR)
2 - Dexter FORTRESS 3.5" Diameter Aluminum 21-88 Oil Cap for 9-10,000lb axles (K21-302-00-PAIR)
$84.00
Cargo Control 2" x 18" 10M Short Fixed End with Ratchet (FH10R1.5SER)
Cargo Control 2" x 18" 10M Short Fixed End with Ratchet (FH10R1.5SER)
$16.34
10,000-15,000 LB Multiple Axle Heavy Duty Hanger Kit Fits 3" Springs Can Replace Dexter's HAP-203-02 (HAP-203-02)
10,000-15,000 LB Multiple Axle Heavy Duty Hanger Kit Fits 3" Springs Can Replace Dexter's HAP-203-02 (HAP-203-02)
$534.80
4 - Dexter FORTRESS 4" Diameter Aluminum 21-36 Oil Cap for 10-15,000 lb axles (K21-301-00-FOUR)
4 - Dexter FORTRESS 4" Diameter Aluminum 21-36 Oil Cap for 10-15,000 lb axles (K21-301-00-FOUR)
$187.04
2 - Dexter FORTRESS 3.75" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-304-00-PAIR)
2 - Dexter FORTRESS 3.75" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-304-00-PAIR)
$84.99
PC82
2" Pintle Combination 10,000# Chrome Ball 16,000# Capacity Solid Steel Trailer (PC82)
$94.66
Dexter Hangers & Attaching Parts Kit 10K-25K Single Axles with Double Slipper Springs HAP-161-10 + HAP-161-11 = HAP-161-01 ONE Kit is TWO Boxes Hutch HDSS (HAP-161-01)
Dexter Hangers & Attaching Parts Kit 10K-25K Single Axles with Double Slipper Springs HAP-161-10 + HAP-161-11 = HAP-161-01 ONE Kit is TWO Boxes Hutch HDSS (HAP-161-01)
$545.04
Cargo Control 2" x 18" 10M Short Fixed End with Ratchet (TSH10R1.5SER)
Cargo Control 2" x 18" 10M Short Fixed End with Ratchet (TSH10R1.5SER)
$19.99
Lot of 20 Cotter Pins 1/8" x 1-3/4" Common 2k-8k Cotter Pin Trailer Axles 1" Spindle(165649-LOTOF20)
Lot of 20 Cotter Pins 1/8" x 1-3/4" Common 2k-8k Cotter Pin Trailer Axles 1" Spindle(165649-LOTOF20)
$9.50
4 - Dexter FORTRESS 4" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-305-00-FOUR)
4 - Dexter FORTRESS 4" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-305-00-FOUR)
$189.03