Any form of spreader will do the job:
Loads on Ebay: http://www.ebay.co.uk/itm/Professional-Brake-Disc-Piston-Pad-Spreader-Seperator-Car-Auto-Caliper-Hand-Tool-/331957949649?hash=item4d4a3c54d1:g:Aj8AAOSwvzRXyS1A
These work at half the price:
Just check that they are the correct application.
https://www.mdsbattery.co.uk/shop/productprofile.asp?ProductGroupID=9375&utm_source=Google&utm_medium=base&utm_campaign=google-base&gclid=CN64z6Wm0dMCFXEz0wodzCcFXg
http://www.ebay.co.uk/itm/Fits-Nissan-350Z-Z33-3-5-Gran-Turismo-4-296-Yuasa-Battery-Vq35De-02-05-12-05-005-/371317460869?fits=Model%3A350+Z&hash=item56743ecf85:g:5XsAAOSwBP9UWO4v
http://www.ebay.co.uk/itm/VARTA-D47-560410054-Car-Battery-TYPE-005-005L-12V-60AH-540A-4Yrs-Wrnty-/282285260602?hash=item41b9833f3a:g:2gYAAOSwuspY-NCN
370Z Roadster Reg # NL11 OGN
For sale at Kintore Car Sales Aberdeenshire
http://www.kintorecarsales.co.uk/used-cars/nissan-370-z-3-7-gt-2dr-inverurie-201702242635670
Alex.