Finally getting to it!!! 1970 Duster 340
I'm sure that's not the news you wanted to hear about the bumper slots. I'll try to get in touch with a friend who has a bunch of Dusters and parts cars, and see if he has a good rear bumper core. If so, I'll PM you his info to hook you up. The way your car is progressing....I'm predicting red paint before cold weather! :)