Interesting, I was skeptical since the free length differences were huge between the pinks and the USDM spec B springs as shown. I was on a hunt for the ST2033021010, but it seems the free length is approx to the ST2033021020 spring. I'll move forward with the sprinGs I have, and keep the folks here updated on the outcome. Also, do I need JDM top hats to go with STi Pinks, or can I use the USDM Spec B top hats? Thanks!