Yes, you can use the outer basket from your 7 pack assembly and swap your current whole 6 pack inner hub into it. Steel and friction plates are the same so you can use any of them. Might want to measure their thicknesses and use the best ones. 3mm thick is the as new spec for the frictions and many are still like that. The stock friction plates are pretty robust. The steels usually don't wear much but you can check them too if you like. New spec on them is 1.4mm. That steel damper plate retained by the wire at the bottom of your current inner hub is different. Even though it looks identical to the other steels, it's slightly thicker @ 1.6mm.