I saw that as well. I think they have not fully updated the XR8 sheet from the XL version. That would explain the XR8 not having all the other colours. If you have a look at the options however the second airbag is optional, they said at the time of release of the utes that some people would rather save the money than have a second airbag.
--Lowndes, Bargs and Ingall, all got sick of promoting an inferior product--