G'day

Am after some information regarding cross members. I understand that they are different depending on what box you are using - and have also heard that they are different between utes/vans and wagons/sedans even for the same style of box.

Can someone point me in the right direction? I want to run a 4 speed bolted to a 308. Which one will i need? Or more to the point which other ones can i use that will work?

Thanks

Dave