I think the op is looking for a removable pylon in general since the moomba pylon is fixed and the supra pylon spins flat?
probably never, as that is part of what keeps the moomba a value line boat and dealers able to upsell into a supra..

now if he is looking for a true center pylon like a dd boat, then I'd echo ed's post x1000. waste of space and money imo..