i have a 2003 audi a4 quattro 1.8t. ST coilover part number for my car is 90605. this morning i was on ebay and came across a private seller that had brand new, front coilovers for $325. a full set cost $800 so i bought them trying to save money. now im faced with the task of either finding rear only ST springs, and perches or just piecing a kit together. i need some help with either. can i just get perches and lowering springs to make the rear. if so, where do i find perches because i cant seem to find them. ive posted on several forums, checked local craigslist, checked forum classifieds, posted on local facebook pages and ive had zero luck. its still the first day but the lack of information is starting to worry me.