You can normally get a set of Land Rover steels for pretty much nothing and just swap your tyres if they're any good. What you've got is fit for the scappy, I can't believe anybody would want them.
those type of wheels come in both 15" and 16". If you've got the 15" you won't be able to swap the tyres onto landy rims when you get them ... landy rims are 16".
I think these are original wheels, just bought an 84 series III and it has the same wheels the only problem is mine only has three on plus the spare which is different