I wish you'd have mentioned it sooner. I have a quick fix for that. Have a look under the driver's seat. There should be a large black box, probably with Alpine written on it. Slide the front open, push the button and voila out comes a box containing not one, but 6 bright, shiny, spare flywheels
I think you will find that wasn't a hill you were coming down . But a cliff you just drove off ! Unless it was Everest ! But I still don't even think that would be a big enough run down hill to hit 160 ;-)
Here at LandyZone we have plenty of very knowledgable members so if you have any questions about your Land Rover or just want to connect with other Landy owners, you're in the right place.