Woody, I use these as servos.
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=3844568448
As you can see they look pretty similar to the picture you have.
I guess if you can fit an encoder on the back then they are the same.
These servos work for me very well.
You could save a lot of money if you can do the conversion yourself. I bought these servos a long time ago for 150 each. I guess if you have success with doing a conversion you will have a lot of others following you.