How can you tell the difference between the two types of bolts? These bolts are for wheel spacers with aftermarket wheels for the taper and OEM alloys for the radius.

Thanks.

this might help

 

http://search.aol.co.uk/aol/imageDetails?s_it=imageDetails&q=wheel+bolts+types&s_chn=hp&v_t=aoluk-homePage50-engmodusaolp00000011&b=image%3Fs_it%3Dtopsearc

If you look at the part of the bolt that sits in the wheel it is obvious

Taper straight, radius curved