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Steering wheel is toast. Cracked and separated. Look for another one or send this one away to get re-done. I haven't had this problem with my seats but I would think that you should be able to crimp the molding together a little at a time to make it bite. Appears that the molding has simply expanded from coming off to many times.
That top chrom trim is only pinched into the plastic seat back. I would try and put it back on and pinch it tighter
The steering wheel like others said cracked. If your handy you can try a two part epoxy and dye it brown to match and then fill it in and sand it back out. If not look for a good used original They are all the same from 64-66. Or you could just buy a teak wheel
To fix the trim on the seat back correctly you will have to remove the seat and the seat back.
Slide the chrome trim back in place. Place a towel on your workbench and carefully tap the chrome trim from the inside crimping it in place.
Roll the plastic seat back as you are tapping the trim. Make sure it is fully pushed onto the seat back. I do it this way all the time.