['75 308 GT4 (Peter)]

The threads are common amongst a large variety of Ferraris, so it should fit. But, as the carpenter's saying goes: "Measure twice, cut once...", unscrew the original knob from your shifter and measure the thread, confirm this measurement with the person selling you the aluminum knob...

Can't answer the cover question (casually looking for a cheap one myself! :wink: ).