Chirco Performance offers the stock 85.5 mm air cooled VW Dune Buggy piston and cylinder sets as well as our slip in a big bore 1641cc 87 mm big bore Sand Rail piston and cylinder sets, these fit all standard Air Cooled up right engines . We also offer Big bore pistons and cylinders for your performance Air Cooled Dune Buggy and Sand Rail engines that you will find located in our performance engine parts categories.