Just wondering if it's a compatible combo. The stock K-member has a pocket that holds the spring both on inside and outside of the coils. The BMR K-member has only a cylinder that holds to the inside of the coils. That's the only thing that will hold the weight jack in place.

 

The GC adjuster will most likely fit loose on the BMR K-member. I assume the K-member spring holder's outside diameter is roughly the same size as the inside diameter of a 5.5" OD spring. That was the case for my Spohn K-member. The GC adjuster has a larger ID than the spring if I remember correctly. So what I did is slit a heater hose and put it on the edge of the adjuster. That created an interference fit between the adjuster and the k-member. It also acts as a noise and vibe barrier. I have had no issues with this setup.



Here you can see the fit is snug. The interference fit is what is preventing the adjuster from falling.

 

What length springs do you guys run with the weight jacks? I've got a racecraft k member and will be using weight jacks.