go wing installation

[BabyBee1]

trying to install a spoiler on the rear of my 72 Dart Swinger but having problems with how the brackets line up on the bottom side of the trunk lid, has anyone installed one of these and do you have pics of the bottom side where it mounts?
any help greatly appreciated thanks,

 

[A56]

Is it specifically for a '72 Dart and it didn't come with instructions?

 

[Yote]

Used these on my ‘72 Demon. My lid had the cutouts for a wing. I could get pics if needed.

Edit- realize yours is not a Demon but thought it might help.
Yote

 

[sabre67]

Hope the picture helped