I know your pain, my replacement headlight housings are terrible and rattle around... We've taken on a TON of small projects for a bunch of cars and trucks recently and we'll put that one on the list for sure! Time-line wise it might be a while to get to but we'll keep you guys updated.
Our main GMT400 focus right now is the 88-94 holley dash bezel and a radio delete panel for the same years to house the holley 3.5" monitor, or whatever else we decide to put in that space (backup camera screen?). Also in testing is a tailgate handle for pickups that also houses a backup camera (like new model trucks).
We've also started using a new material / printer that allows us to pop parts out about 2x as fast, and for about half the price. We plan to offer that on our current products eventually so stay tuned guys!