RE: Are these the right alloy upper arms?
those have the onroad turnbuckles but the alloy part will fit...exactly the same ones i had on mine, all the off roads have the longer turnbuckles that are common to MT, baja, marder...
as you're from blighty you have the best used fg parts source on the planet....ebay.co.uk, you can get good used bits for less than half price usually