These pro wound, stainless spring steel, factory fit, lighter gauge throttle return springs for the Bing Model 64 carbs found on most Airheads are still available. The 64 has also been found on some Rotax ultralight motors, and the occasional Cagiva, but on Airheads they really provide wrist relief going the distance, and more fun in the twisties. The difference is amazing. Hundreds sold. They really work... They are $12US a set, includes shipping world wide. All ordering info is on the website: bmwthrottlesprings.com Thanks, Tony Heyman bmwthrottlesprings.com