Do you have 67-72 style K-member or 73-76 style?
If 67-72 style, I would not go Addco. OR, only go Addco if you additionally buy the Energy sway bar adapters (p/n ES55134G or similar) and the 1 1/8 bushings to fit them.
Compare total cost of decent brackets to Hellwig, Hotchkis, Firm Feel.