See if you can "build up" the top side of the sliders a bit with tape or something and try closing it. If you can get the tape on so it's smooth and the panel will slide over it at least it will tell you if that's the problem. If it is I'd see if a slight bend until you find another set from a wreck might work.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold