I purchased a Ducktail spoiler for my vehicle and it looks like it somehow got damaged in transit. What is the best way to fix this spoiler? The spoiler is made out of some sort of foam how do I re-attach the main piece back together?

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2005 SL65
1999 E300
1995 E300
1994 SL320
1988 560SL
1987 300TD
1982 300D
1955 300SL