Can't help without good pics. First I've seen reference to a shift fork in many moons. The shift fork came loose on my wife while she was driving it to work on our 1969 Alfa Duetto Jr. She called me about it. I went to get the car, leaving her the lowly Fiat 124S sedan. Had to drive back in 3,4,5 only. Luckily, it would corner fast and all. The bolt holding the shift fork in place just unscrewed. Found it against the magnet in the bottom of the transmission case.
Ralph