Moved to General Tech Chat.
You'll need a full synthetic manual transmission fluid, the current Ford fluid is a safe recommendation. 2 qts. is all you need by current recommendation, not the 2.1 originally specified.
Even Mobil 1 in a 50W version has been used successfully, you DON'T want anything in a GL-5 or non-synthetic gear oil.
While it's not necessarily the end of the world, some GL5 fluids have additives that can cause premature wear on brass/bronze synchros (although many GL5 fluids claim to be compatible w/yellow metals).Oops, I used gl5 for like 6 months lol