The 4agze and the e58 gearboxes use the same spline as the w55/57/58 boxes. However generally a 4agze clutch wont fit inside there custom bellhousings.
The tailshaft will need to be custom use a ra65 front yoke with what ever diff rear and get someone to make one up to the right length.
Speedo cable is mechanical. What car you putting it in? The factory one from a corolla should fit onto the w series ones. Not 100% about this.
starter motor fwd one is compatible.