exactly what your title says steering extension, if you know who put the body lift in contact them, almost all body lifts have that in the kit.
I was told it wasn't needed, someone said the shaft would slide down enough on it's own and not need it. I guess they would be wrong in your case. Man that would suck be driving down the road and pop, out comes the shaft and no steering afterwards, not to mention how dangerous.
Good luck on trying to find that piece only, my olny words of advice is call or contact performance accessories, summit or zone offroad and see if you can buy that piece only.