is there a particular reason for the 5 stud? The rear end is the easy part, its the front that will give you the troubles, there are ways to do it its just finding the parts!

For the rear on mine i used a EF falcon borwarner, changed the pinion and crown wheel to 4.11 gears (as it was 3.2:1!) The standard EF diff is around the 1550mm mark disk to disk (dont have the exact measurements handy) and you need around 1330mm for standard 1200 width (however mine was shortened to 1220mm!) shorten the housing and the axles to suit.

The front however from information i have got off pigdog and others is, you need a bigger nissan strut (180/200B or R31 etc) and some Z31 hubs, then some disks and caliper to suit, there is some talk of ppl using XF hubs and disks but i havent seen that done yet.

I used the hopper stopper 5 stud conversion kit, which was a straight bolt on to 200b struts.

All up to change mine to 5 stud cost me $3150! thats including the front coilover kit for 200b struts and the stanza front end to fit the struts.

If you dont need 5 stud i would save the money and not do it personally lol