A 10' quick-tach head is going to be hard to find. Your going to have to find an area with a lot of small farms that are still going and find the closest combine junk yard to them and check it out for one. Check Craigslist around you and other areas for one.
Now as far the mechanical drive for the reel, They can be changed from hydrolic to mechanical. I have changed 3 quick tach heads over for my old JD 95s over the years. I will post some pictures later today and the how to change one over. Bandit