94 Q45a::Need the black plastic fin within driverside tail lamp housing!

[breichert]

The dealer wants to sell me the entire housing for $250.

Now without the fin within the housing both driving light (red) and turn signal (yellow) are illuminated. The fin prevents the illumination of the yellow signal.

Not sure where to source one from a junkyard -and must have the two screws to set the fin with too.

Thanks in advance for anyone's direction!