I bought the WIPAC headlights bowls for the IIa and cant figure how they go together.

they dont come with a diagram they have some parts the originals dont have and some parts are missing. Even using the right screws in the right holes is problematic here.

Can someone provide a link to instructions? The small picture in the RN web site does not show what screws go where, nor does it show the sequence of steps to putting it together