Heads: Founder style and regular.
The Founder goes in the slot no problem but the standard head needs this filler piece and collar before it will sit right. Different geometry and all.
So the lower legs have the knee joint and these bits for left and right.
Next, the SRM 6 has this little bit on the bottom.
Itti bity groin shields. go here.
Ankle shield.
Hip joint bits for left and right.
And a tiny little instep shield goes here.
For the most part that should be the most WTF bits. Hopefully everything else will be fairly straightforward.