headliner help on 55 1st series

[drivesfed]

The truck had no headliner in it when I bought it. I ordered a headliner, it came in two pieces and I have no idea how it mounts. I have the strip from the back of the headliner that holds it in place, but no other parts to help install or hold it in place. What am I missing here? What holds the headliner to the front? What holds the two pieces of the headliner together?

I have the cab, chassis, engine, and interior painted and am ready to tackle the inside.

Any advice is appreciated.