Driveshaft you can get from whereever... the pricing is usually not too far off from one place to another. Figure on 250-350 bucks for a nice 4" balanced shaft. I'd get this one:
http://www.mustangtuning.com/96gtand96coa.html
Your existing yoke is more than sufficient. There's no reason to replace it unless it comes with your new DS.
Rear end I would use:
http://www.brothersperformance.com/c...roducts_id/461
and
http://www.brothersperformance.com/c...roducts_id/876
Where you get them from is your business but I'd call up MT and ask if they can or will get the parts for you. they don't list them on the site but that means little.