Advance Adapters now offers Jeep Iron Duke slave cylinder kits that bolt directly to their bellhousing. They work well with most Jeep master cylinders and fit both GM and Jeep bellhousings that Advance Adapters manufactures. They are made of cast iron and have a natural finish. If you're replacing your bellhousing on your Jeep, then these Advance Adapters Jeep Iron Duke slave cylinder kits are must-haves.