Talked with a machine shop that will do both adapter plates shipped for $315, 5 day to get made and priority shipped.
Then with the adapters and flange yokes might be able for a 05 -09 mustang driveshaft to be a bolt on.
Have my 4" aluminum, and picking up a 3" mustang driveshaft this evening if I can have the time, and can check the lengths and test fit.

Still need to weigh stock driveshafts.

How much have you spent to have your oem shafts rebuild with new flex discs, center carrier bearing and u joint ???