Recently I saw an ad for adult use rear shock springs for XR/CRF50's that measured 150mm (approx. 6 1/4 in.) in length. The company offered two rider weights 90-160 and 160 up. I'm not sure what year XR/CRF's these were for but I know that 2000-2005 rear springs (stock) are about 4 1/2 in. Anybody seen this ad or know where I can find 150mm aggressive springs? I need the 150mm length for....uhhhh...how can I put this....a knock-off.