Hi Carl, I have some spares but your best bet would be to join the Almarine Meteor and Seafire Lovers Facebook page. I'm on there along with around 400 others and between us we should be able to help you find the bit you need.
Rota 637 parts are a pain though. The engine was only ever fitted to this boat! Its a marinised aircraft engine.
1977 Almarine Meteor Jet Boat
Re: 1977 Almarine Meteor Jet Boat
1977 Almarine Meteor Jetboat Restoration http://almarinemeteor.blogspot.com/