Has anyone installed one of these into a 70 Cuda dash? It was supposed to be a direct fit, but for the life of me I can not figure out how to secure the front, as it just slides into the opening . I may be having a brain fart or am I missing something? The instructions show nothing about installing it, and their tech support wasn't very good, all they said was "you should have looked into that before ordering"....

Thanks,
Jim