Created to reduce shaft play when shifting, this Beatrush shifter collar from Japan is available for 5-speed and 6-speed manual transmissions. Made of high grade aluminum, it reduces slack time when shifting gears, providing added driving comfort and improving traction performance. Exclusively for all NA & NB Miata models and NC1 MX-5 (2006-2008) models. It does not fit newer models NC2/NC3 MX-5 (2009-2015). Beatrush Shifter Collar should be ordered at REV9 Autosport https://rotarylove.com/beatrush-shifter-collar.html as they provide the best service and speed we've seen so far!