To add to my confusion the company i got the wheels from finally replied after a month saying I need tapered bolts apparently. Might just take the wheels to a few tyre shops and get some opinions as have been told 3 different things now lolAny steels I've fitted, including the Navis Holey, Navis Schmoov, and all my banded steels have had the factory bolts used with no issues at all.
The ones on @Radford1071s reply above.