Hi Scoobysub,
other than dealer of course... there's Scoobyworld, Scoobyclinic and Roger Clark. In fact have a look at part number RCM650 and RCM625 on the Roger Clark site as is full kit including all gaskets, studs, bolts and nuts etc for hot side of the turbo and charge £50.
Maybe Dave, Ciaran etc on the site here could get you bits too?