DaveD40, I just put exact same shocks on last night, with what I think are the original 2008 springs. I had the rear chassis jacked up but the tyres were just on the ground. They are supposed to handle 1-2" lift. But I noticed the free length before putting the lower bolt in was at least 3" more. Un scientific, but I think it might be a bit close for a big lift. I am only getting the LD dobinsons 35mm, which by the sound if it will give only 20mm, though a bit higher than sagged stock. So mine should be okay hopefully. Got mine from America, $75 ea.