Here's a cut paste I snagged.
If I remember correctly the reason you want to use the 94-95 they have the closest transfer curve to the fox computer. You don't want to slap on the wrong MAF as it can cause the engine to run lean even though you may not notice it.
Here is a list I did of interchangeable MAF's a few months back.
1995-94 Mustang 3.8L F2VF-12B579- A1a or A2A,
1994-92 Crown Victoria 4.6L F2VF-12B579-A2A,
1995-94 Mustang, Mustang Cobra 5.0L F2VF-12B579-A2A,
1994-92 Town Car 4.6L F2VF-12B579-A2A,
1994-92 Grand Marquis 4.6L F2VF-12B579-A2
For the flange adapter, you can either buy this adapter , look on ebay, fab on up.
http://www.kustomz.com/components.html