I invested in a hydralic lift for my garage, it was getting harder to get up from working under the car using drive on ramps, axle stands and trolly jacks, lifts the Z3 and Z4 sufficently high in my garage to get all four wheels off the ground to about waist high with the hood down to fit under the garage roof cross braces. Four swing out arms locate under the jacking points.
http://www.bhrepairs.co.uk/
They sell on ebay as well but I dealt direct, delivery was made within the week. It comes on a pallet and you need the delivery to be made by a tail lift equipped lorry and at minimum a pallet truck to move it to where yo want it. Needs a 32 Amp mains circuit to supply power to the pump. I should have bought one of these years ago.
It needs some scaffold boards either side to drive the car on to clear the lift, sourced those from my local timber recycling centre for little money.