1972 Duster , lower control arm sway bar brackets

If your '72 lower control arms have the sway bar tabs, then use those control arms- they'll work just fine with the discs. It's the upper control arms that need to be changed for the disc brake swap.
Firm Feel has the tabs if you need them, or yes, you can make them.

Yes I have the whole setup from the 75 upper an lower but neither my original or the 75 have the tabs welded on

What year k-member do you have ?

Is this for a 1972 A-body ?
I have a 72 at the moment but has a slant six k member and I plan on swapping for a 73 or up spool type if I can find one

For a 1967-1972 K-member with sway bar in front of K-member

Hotchkis Sport Suspension 23366 Hotchkis Sport Suspension Sway Bar End Link Mounting Brackets | Summit Racing

Those are listed for B-bodies but they work for Abodies.
I will check this out thanks