help what front suspension do I have

[Arizona oldguy]

I am building a 67 short bed, using a 72 short bed frame, my problem; I am trying to rebuild the suspension, found what I thought were 72 lower control arm bushings at the local Chevrolet dealer, the ones they have are screw in type, the ones on my frame are press in type. Maybe someone put a newer front suspension on it, it does have disc brakes and it looks like it grew there but not sure, any help is much appreicated.