the 6 and 7 diff housings are the same so that means the 7 captured arm holder will bolt straight on but there are a few issues to be addressed, firstly the 7 arm holder on the rear are wider so you will need the 7 rear arms, hubs and shafts cause they are 3.5mm on the 7, not sure if the droop screws will be touching the chassis being wider.
Up front, a mate did the 7 holders on his 6T, he had to cut the chassis cause the rear holder has edges that locate over the edge of the 7 chassis, or you could trim those edges off.
In the end you might be better off spending a few hundred on a good used 7.