Rear headliner support bars/frame (?) for 88 alpine top

Hello all,

I am in need of the framework/supports for the rear half of the headliner that goes into an alpine roof for an 88 (one with vents and side windows).

I have never seen this part, so am a bit unsure what I need. All I know is that the front half of the old headliner is in there (I can slide it forward and backwards with the "bars" inside this headliner piece), but the rear half of the headliner is missing altogether, and I assume it requires some kind of support bar setup similar to the front.

Cheers,
Julian