Its a GM 55557587 from Saabs with the 1.9 TiD plus assorted other GMs
It matches up with a 16mm master cylinder which opens plenty of options for different mounting types.
As for bolt patterns and the bearing face, I'm nowhere near either so can't look right now. If anyone has a release bearing handy and the sleeve from the gearbox that'd be great. Otherwise I'll have to get the old man to have a look tomorrow
Presumably it'll bolt up if Luis' is the same but its whether it'll mate up to the clutch face