There is a problem using the seal illustrated, in that it has a dirt excluder lip. The correct seal, was made by GACO (George Angus), and although of a standard ID, OD and width it was slightly different shape on the outer side of the lip area. This was because a spacer washer was inserted against the seal and retained by a circlip. The washer was in three differing thicknesses to ensure a good "nip" when the clip was fitted, it also is shaped to stop the lip blowing out with any pressure building up in the flywheel. I know some people have dispensed with the washer, others have turned it around so that it is no longer protecting the lip from deformation. I also note the diagram shows the seal as metal cased type, I would be happier to use the rubber moulded type to ensure a good seal on the outer rim.
Not trying to be critical, but having done this job on many vehicles over the years, from Dingo to Ferret, Saracen, Saladin, and Fox, I am speaking from experience.
regards, Richard