Disc conversion question

I bought front disc from a 78 Volare. Seller said I need to use everything he gave me to fit my 73 Duster. He gave me UCA, Spindle, LCA, steering tie rods. Do I really need to use it all or just the UCA, spindle, calipers? I don't think I need UCA or tie rods at least nothing online says I do. Drum setup is my car and stuff on ground is what I bought.

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