what material is an original shaker bubble made from ?

my shaker bubble is an original Challenger part with the part number and pentastar embossed in the bottom side , I have a slight repair to make to one of the posts on the bottom side that the right grill is screwed to , (post is split and the hole is stripped oversize , due to an oversize fastener being forced into it ) . Is it ABS , plastic , or a type of fiberglass ? its a white plastic type material but not sure if ABS , or what ? I want to make sure to use the proper repair compound...

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Author: Hemi T/A