I suggest try posting to E Bay for your needs if not done already.
Although not manuals I have obtained several old, discontinued, outdated and out of production tools that way.
Be patient though. Also look to find their long term posting feature under which if someone posts what you are after they will then send a message to you of the poster. I got several items that way. So be specific offering as much into as you can.
And find that posting feature of which the label escapes me.