Race Consulting Agency told me that they were out of stock, and they would not be getting more because it appeared to be out of production. That was part number MRS-SU-0511-02. So I ended up going with the Whiteline KCA399, which gives less adjustment but will hopefully be enough. Not looking forward to installing it though, looks like it will be a pain to install. They will also work with the stock bumpstops, which is good; I'm not looking to bust any shocks soon.