im collecting parts to do a 72 dart front drum to disc brake conversion. i have the following 74 dart upper a-arms,spindles,and backing plates.where is best place to get new a-arm bushings,ball joints,rotors,calipers,brake hoses and proportional valve for disc,and master cylinder????thanks guys

also do i need the offset a-arm bushings for upper a-arms or can i use the non offset bushings

Rockauto tends to be the lowest price, especially if it all ships from one location.

I've also used amazon to get parts.

I used the lightweight aluminum MC from Rick Eherenberg. I used the offset bushings, but they're not really necessary. I got a used prop valve, but I believe they are available from Inline Tube (???). The rest of the parts came from NAPA.

not an absolute but I would suggest using them.

Disc brakes don't use backing plates??? Also what bolt pattern does the disc that you will use have? You rear axles are 4 inch aren't they?

i said backing plates,meant dust shields,front will be 4.5 bolt circle,back will be 4.5 also.