L.E.N. said:Hello Piero,
On my Dunstall the fiberglas seat base has a hook under the tail to attach under the back of the support loop, and holds to the fuel tank by Velcro. The seat cover is held to the fiberglas tail piece also with Velcro. Some have said this is a rather "inelegant solution" but it does work well and I actually like it. I can open the Velcro at the rear seat to tailpiece junction and place my registration, etc. there for easy access. I hope this helps.
Lance