Unknown part found on my seat and floor

I need some help with identifying a part. When I got into my car this morning half of a white plastic part was sitting on my passenger side and half was on the door sill. Please see attached I'd really appreciate knowing where it came from. it appears to have rust marks in it. I also found the ball clip in the convertible top on the passenger side disengaged any help would be greatly appreciated Sol 1999 sl500 104k miles [ATTACH... Unknown part found on my seat and floor

I need some help with identifying a part. When I got into my car this morning half of a white plastic part was sitting on my passenger side and half was on the door sill. Please see attached I'd really appreciate knowing where it came from. it appears to have rust marks in it. I also found the ball clip in the convertible top on the passenger side disengaged

any help would be greatly appreciated

Sol 1999 sl500 104k miles

[ATTACH...

Unknown part found on my seat and floor

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