Hi All- Doing some more spring reasearch and hoping someone can clarify for me. In the Eibach catalog, there is a spring set listed for the A6/100 with a PN of 1528.140 and the one for the same year for the S-car 1529.140. Are these the same dimensionally except for spring rate? Could the A6 one be used in place of the NLA 1529.140? Thanks, Riff