I recently bought the Whiteline caster kit. Going from the pics on the Whiteline site I thought it was going to be adjustable upper control arm inserts, but it was just a shim kit for the lower control arm. The lock nuts and bolts the came with the kit that were supposed to go together were different pitches so I sent it back, but not before I made a trip to the hardware store and scanned the install sheet. This is the parts list and install sheet for a 5th gen civic: Whiteline Caster Kit 2 7/16”-20 four inch long bolts, 5/8 head, stainless or zinc plated 2 7/16”-20 nylon-insert lock nuts 20 7/16” SAE size heat treated washers 6 1/2” SAE size heat treated washers The kit says the washers are 2.1 and 3mm thick. This is not the case. They are about 1.575 and 2.667mm.