742 case question

I have recently bought a complete 742 case unassembled and I am trying to build it up but I don't think all the parts are there. I am used to working on 489 cases with the crush sleeve and I know my 742 needs a solid spacer with shims I have plenty of shims but I don't know if I have the correct spacer the spacer I have is about 1 1/2" wide and it does not go in between the pinion bearings it looks as if it were to go between the outer bearing and the yoke and it looks as if it would be a small type crush sleeve. I would actually like to see a breakdown of all the parts I need for the 742 case and how it would go together. Any help would be gratly appreiciated!!! Thanks