Top tip when fitting a new spigot bearing on a 105 1600
First check that it will slide over the gearbox input shaft, else you could waste days trying to align and realign the clutch when refitting. AMHIK....
input shaft diameter: 16mm
Dodgy spigot bush internal diameter: 15mm
Fortunately I found a 16mm milling bit in the toolbox with a slightly conical end to aid in alignment.