Just in stock - Sigma Performance slipper clutches in standard ($850) and 48T ($895) versions. Developed by Sigma's race team in UK. Plate sets also available, $200 for standard and $250 for 48T sets. Buy the plate sets along with your slipper and get 10% off the plates. See the article on the site for pic and links to Sigma information. Free ground shipping to Speedzilla members. Be sure to tell Christin when you place your order.