the hypercos go for around $200 a pair in 65mm id and the SWIFTS go for around the $260 a pair shipped, these are approximate prices you should email Michael for current ones. The Swift springs i bought were about 15mm shorter but this is because AST standard springs were in between 6 and 7''. All i have to do is raise the lower perch by about 12mm to get the same ride height (they were stiffer as well so the 4mm will compensate for the lower static compression).