Anyone know the trick to this?

I have taken apart the post '90 wagon lower hatch strip before, which has two sections. But I can't figure out how to do it on the early wagon, 87-89 without the stainless trim strip.

Many thanks

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David Hendy
'97 Renntech E60RS
'97 GMC 2500 Sub' Diesel
'95 E300D
'88 300TE
'88 250TD
'84 L/Rover 109