Pin on calipers vs 72 Duster lower control arms

Those Pin Type calipers that you have with the fitting at that location, don't work.
They appear to be 73 and up B body calipers, and other mid 70's body styles.
You really need to use calipers that are off 70-74 E Bodys, and 70-72 B bodys, with the hose location in a different position on those calipers.
If you do use B, E, calipers as described above, they will require the appropriate hose, also.