For those of us who tinker with their cars and use a trolley jack these small jack pads are available to save any damage to the car jacking pads. The small jack pad fits inside the car jacking point and you then lift the car with your trolley jack using this.
I bought this for the Z4 (none available for the Z3 apparently!) and when it arrived I checked and it fits both cars
I bought these from eBay here. £4.39 did not seem too bad but looking again I see there are some at the £2-3 mark
http://www.ebay.co.uk/itm/151104545233?_trksid=p2060353.m2749.l2649&ssPageName=STRK:MEBIDX:IT
I bought this for the Z4 (none available for the Z3 apparently!) and when it arrived I checked and it fits both cars
I bought these from eBay here. £4.39 did not seem too bad but looking again I see there are some at the £2-3 mark
http://www.ebay.co.uk/itm/151104545233?_trksid=p2060353.m2749.l2649&ssPageName=STRK:MEBIDX:IT