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Your search for "spindle castle nut" revealed the following:

FlexiRide 3500# Spindle Arm EZ Lube FA-35 Torsion Trailer Axle Boat Flex Ryde UG (FA-35P LUBE-KIT)
FlexiRide 3500# Spindle Arm EZ Lube FA-35 Torsion Trailer Axle Boat Flex Ryde UG (FA-35P LUBE-KIT)
$73.14
Build Your Own Axle Hub Kit with 4x4 Hubs 2000# and Round Spindles (BYOAK-BT8-H440-R)
Build Your Own Axle Hub Kit with 4x4 Hubs 2000# and Round Spindles (BYOAK-BT8-H440-R)
$112.99
EQ-13-Kit
Equalizer for 2" Wide Slipper Springs 13" Long 7/8" Center Hole W/ Nuts & Bolts (EQ-13-LN-KIT)
$37.88
Jam Nut for 10K 12K 15K Spindles fits hub 8-214 8-216 8-422 8-401 (006-084-00)
Jam Nut for 10K 12K 15K Spindles fits hub 8-214 8-216 8-422 8-401 (006-084-00)
$12.99
Spindle End Kit 9k-10k General Duty Trailer Axle After 10/89 (WK-10K)
Spindle End Kit 9k-10k General Duty Trailer Axle After 10/89 (WK-10K)
$17.74
STUB-84-545-DR
5 x 4.5 Right Side Brake Assembly Spindle Kit Stub End unit Trailer Axle 3500 84 (STUB-84-545-DR)
$149.08
10K Lippert Spindle End Kit, Washer, Nut, And Cotter Pin For Trailer Axles (SEK-2)
10K Lippert Spindle End Kit, Washer, Nut, And Cotter Pin For Trailer Axles (SEK-2)
$23.78
Spindle Washer Hex Nut End Kit for 12k & 15k Trailer Axles(K71-341-00)
Spindle Washer Hex Nut End Kit for 12k & 15k Trailer Axles(K71-341-00)
$40.88
Trailer Spindle for 2000# Axle Shaft EZ Lube Windmill w/ Brake Flange (SP-150BT16FZ)
Trailer Spindle for 2000# Axle Shaft EZ Lube Windmill w/ Brake Flange (SP-150BT16FZ)
$43.99
Weld-on 2.375" E-Z Lube Round Spindle W/ Brake Flange Trailer Axle #84 3,500-LB (66-84LZ-KIT)
Weld-on 2.375" E-Z Lube Round Spindle W/ Brake Flange Trailer Axle #84 3,500-LB (66-84LZ-KIT)
$25.77
STUB-84-550-H
5 x 5" Replacement Idler Hub Spindle Kit Stub End unit Trailer Axle 3500# #84 (STUB-84-550-H)
$55.99
1-3/4" Spindle End Kit for 12-15k Trailer Axles Round Spindles 2 Wheels (SEK-3-L2)
1-3/4" Spindle End Kit for 12-15k Trailer Axles Round Spindles 2 Wheels (SEK-3-L2)
$64.28