Manual issues

Question

Have reciently purchased a kirby from ebay (gotta love ebay) but has no manual. I believe the model is a heritage (cant see a II though) Do they all have roughly the same manuals???
I have all the attactments - spray painter, hair trimmer, turbo brush etc but really want to get the most from the machine.
Where do I get manuals for machines that are 20yo???!!!