I've just been crawling under Harvey measuring rear spring centres and comparing with the Rover axle. Commer spring centre 43 1/2" - Rover 41 3/4" so they won't fit straight on, but it would be fairly simple to widen the saddle and the shocker mounts would still be there to make fitting telscopics a bit simpler. Trouble is the Rover springs are under-slung, fine if you want to slam the rear end, but what if you simply turn the axle over so you can mount the axle under the springs to get the normal ride height. Is there any reason this can't be done - apart from the diff drain plug being on the top, could the brake back plates be swapped over side for side so the cylinders - and bleed nipples (I'm not getting caught out again:I) are in the right configuration. Or would it be simpler to make new mounts [8)]
'Harvey the RV'