no vauxhall ever had a F23 gearbox with 4 stud wheels,all 1.4,1.6.1.7 and non abs 1.8s had 4 stud wheels,all of these would have used the f13,f15 or f17 gearbox.the abs 1.8s,2.0 and 2.0dti and 2.2 all used either the f17,f18 or f23 gearbox,to answer your question if you were to say you wanted to fit an engine with a F23 gearbox to your 4 stud hubs that would not be a problem as there are only 2 main types of hub (4 different part numbers) and the centre spline is the same across all hubs