If you've converted over to a Weber DGV or DGS series or just bought an older Nissan, Datsun, Toyota, Suzuki, or Isuzu that has been, then these gaskets are what you need!The Weber 2-piece adapters that allow you to bolt-on a DGV or DGS series carb use multiple gaskets in-between the manifold and the adapter, the adapter to the second adapter, and that adapter to the carburetor and with this many gaskets going on, it's easy to get air leaks.