Cult-Werktanklift 40-50mm for Harley-Davidson Softail Fxbb 18-21. This product sheet has been automatically translated. If you have any questions, please feel free to contact us. Cultwerk factory tank lift for Harley-Davidson Softail FXBB.The Austrian custom forge Cultwerk. With this kit, it is possible to gradually increase the tank from 40 mm to 50 mm. This way, all cables can be neatly routed under the tank. In our program, you will find many other beautiful custom parts from Cultwerk, the well-known custom forge from Austria!