There's no "strut".Disconnect everything - hub, sway bar, castor rod - from the control arm.
The arm should be a tight fit into the x-member, and may need a spot of "persuasion" (if you get my drift). The hub will slop around because it's only held by the upper control arm. Once you have the arm attached and bolted to the x-member, the hub can be swung into position and connected to the ball joint. Now you can start thinking about connecting the castor rod and sway bar.
The castor rod forms the third side of the triangle to keep the wheel in position, so you may need to lever the hub assembly into position so the castor rod can be connected to the control arm. Connect the castor rod to the chassis first. Then move the control arm / hub to meet the castor rod.