Originally Posted by the infamous...
edc = kw
non-edc = rd
RD springs work with EDC!
Just like EVERY other spring kit. I hate uninformed posts/suggestions. I have RD springs w/e36 bumpstops with EDC.
Also, OP most vendors are going to suggest to you the more expensive part, just because they tend to make more money off it. I've noticed this trend on the forums.