Yamaha KT 100 Radial cylinder heads from my fathers estate 30 + years young and brand new The buy it now price is $ 300. delivered to you in the USA only , If you only want one of them its $ 200. delivered to you , These were used and sold for the Quicksilver and other ultralight aircraft using the KT 100 SD Yamaha engine , they worked well and made them run a lot cooler , Thanks for looking