Bought this 1/4" spacer new a few months ago on Amazon but ended up not using it. No issue with the spacer; the Eibach coilovers I installed are just a shade too high with the spacer, causing the driver's side axle to bind.
Provides 1/2" additional lift on the side with the spacer as suspension geometry provides 2 x spacer thickness in height gained as noted on instruction sheet. $20 shipped to continental US.