There were only minor changes in those years. The EBay CD's are bootlegs, but that being said they're probably accurate reproductions. Personally I'd bite the bullet and buy the book. It's nice to be able to turn to the page you need, rather than trying to print out the part you need for a job. Especially since so many things will refer to other sections of the book (i.e. "first disassemble the muffler bearings as shown in section 3-5, then remove the framulator as described in section 10-2, before proceding with steps 1 through 6 in this section").
I have both! The cd is great, perfect reproduction of the manual with hotlinks throughout. Easier to use than the manual but not a substitute by any means. Pretty easy to flip a page when your on the ground with tools in your hand. Your computer probably isn't down there with you. The convience of the cd is nice though, got a job to do, just print out all the appropriate pages before you start the job then take the printouts and your manual with you to the garage..... If yer only gonna have one, Manual for sure!!!
Thanks for your feedback. I was hunting on ebay for the part number for hte HD manual and they were pretty spendy. I revised my search to NOT INCLUDE the part number and i found a hidden auction that went and sold at $20. I won! I'm tempted to relist it using the part number - hehe