I bought a complete brake parts kit from CJ's. It came with shoes, wheel cylinders and all springs, adjuster hardware etc. I may have saved a few bucks at a local auto store, but I've had too many bad experiences with those places giving me the wrong part or some 20 year old kid whose never seen a drum brake arguing with me.
Go to a good Mustang supply house and get the right thing the 1st time.
I sort of agree with you but, I priced 3 mustang houses and the prices I received were 187.75 + shipping, 151.50 + shipping and 121.95 + shipping. The local NAPA has the parts at 106.85 + tax and has all the parts on hand (Who knows for sure).
I would imagine that all the parts should be the same but who knows. Time is not a factor because these are for a rear end I'll be installing this winter.