by what ive seen theres 3 ways to do it properly, modify the body to suit the t18 bar ends, modify the bar ends to suit the body (what i did) or get the proper jdm chrome bars.
If you go the same way i went, you have to cut the ends off and make new ends using 4mm (roughly) wire to shape the edges and flat sheet 2 fill the gaps.
either way you go, as ke70dave said, the grinder and welder are you friends.