[rsk289]

Great pictures ACHiPo, and yes, it looks very similar to the 289.
The vinyl rear curtain attaches with chromed raised countersunk slotted screws with cup washers, and a single lift-the-dot at the top to allow access. These screw through the trim into the square-section steel frame behind. The top border is elasticated. The cut-outs at the top are to clear the seatbelt mount.