mp brake kit.

O.K check this brake kit out.

http://www.mpbrakes.com/products/product-detail.cfm?product_id=241

Now,I would be going from manual drum to this,but using parts I bought used some time ago.All my brake stuff is factory original.I have calipers,spindles,bearings,seals, pads,rotors,booster, master,valve,lines,brackets,shields,ball joints,even the linkage.Basically everything except for the correct rims.All the rims I have are drum brake rims.

I was reading the new mopar enthusiast and the article on mp brakes kit caught my eye. But the control arms getting swapped confused me.
Wont disc brakes bolt up to the control arms I have? The claim is made that all master power brakes parts are factory original.

If they do,why are they in this kit?