There is a an option booklet. The one I have may be out of date it says effective from 08.02.2008. Rear parking sensors are £345.00 fitted. They are listedin the Accesories Packs section on page 10. But I would guess you would not find a mk5 one at a dealers these days as a result of the new model. It also states cruise control is available to retrofit for £150.