I have a 95 Mustang GT with the 5.0 I need to know what size serpentine belt I need to use I'm going to take out the power steering pump AC pump and a smog pump
I think you'll be short of pulleys with the SN95 routing (since our tensioner isn't where it is on the Fox).
By removing both PS and AC, you also remove the idler from the route.
You 'might' be able to get it to work if you swapped out the idler pulley to a ribbed-type, but I still don't think you'd get the best belt-wrap on the water pump.
(they also came to the same conclusion about using a ribbed idler pulley)
For length, your best bet will be to measure with some string. That will also help you determine if this is viable and if you'll get enough belt-wrap and tensioner action with this setup.