Tilting front seat
I did this- twice- I have a set of buckets from a 74 valiant brougham 4 door, and they use the same hinge setup as my 74 swinger bench. The only difference is instead of a moving latch they install a solid piece to hold the seat solid. So you need the entire latch setup (spring, cover handle, ect.) from a 2 door seat frame. Now for the darts I've run into 2 different styles of seat hinges, on both 2 & 4 doors. I can take some pics if you need. This only helps you though if your talking dart seats though. let me know what your working with and I'll see if I can help you.