As far as the Diamante model goes since they have the '72-'74 style lights....
There is a model made by Testors of a yellow '72 Challenger street machine type car that comes with a custom bullet style nose car that fits on the front of the car. Comes with a supercharged Hemi also. This model, due to the custon nose cap, was my inspiration for a Diamante model. Yah, those rear quarters and wing will take some figuring....
Sorry, I can't seem to find a pic anywhere, even Ebay.
You can usually pick them up on ebay for less than $10 if there isn't a bidding war. I got mine for $2.75, still in the wrapper.