You can now easily mount two telescopes side by side on your mount by using the Orion Narrow Side-by-Side Plate. A perfect solution to simplify your guided astro-imaging setup by placing the guide telescope next to the imager, rather than above.
I decided to mount my 6" RC reflector side by side with my Orion ShortTube 80 as the guide scope for astrophotography. The mount fits perfectly onto the Sirius Atlas EQ-G and the two scopes fit right into place, with plenty of clearance between them. It takes a bit of extra time to balance the scopes on the mount--you must now do it in three steps. First, the usual--swing the RA so the scopes are parallel with the ground and lock the RA in place. Gradually adjust the counterweights on the shaft until the scope is balanced with the RA lock loosened. Next, with the RA shaft still parallel with the ground, loosen the DEC. lock and point the scopes parallel with the ground. Slide the scopes in the mount (or in the rings) until balanced. Third, do the same thing again, still with the RA shaft parallel with the ground, but this time with the scopes vertically pointed. This all takes less than a minute to do, but will balance the system nicely and prevent drive trouble due to balance issues later.
Favorite viewing location: dark skies of northern MI