good idea, also get an input shaft seal and pushrod bush + seal for the gearbox. the GTI needs a bigger seal which is vw only, but dont worry its not expensive. best to check your gearbox code though, just in case its been changed. also should check so you know what clutch you need as well.
no need to change the box->engine gasket, thats just a bit o tin metal. also clutch alignment tool isnt really needed just centre it by eye. it only needs to be close enough so the box fits, as soon as you press clutch it self-centres anyway
