Hi dluth,
Wish I could help you more than this...
Only thing I could find to guide you is a pic of the EQ3 GoTo from the Bintel website (see attached) It shows how the motor upgrades sit on the mount housing. Perhaps approach Bintel for some advice, Don Whiteman there is very helpful.
Skywatcher support pages have downloadable manuals, may be something there
http://www.skywatchertelescope.net/s...t.php?class1=1
All the best
Doug
