If you get the guide rings from bintel they will likely come with plastic screws of adjustment. I found that they were not strong enough to hold a guidescope rigid enough, replace them with metal screws and get some plastic caps to to over the then.
Do you have holes in the top of the rings for your newt? If so you could get a piece of 3 or 4mm (40mm wide) Aluminium bar and attach it to the newt rings and then drill a couple of holes in the bar to mount your guiderings to. At the bottom of the guiderings is a flattened area with a 1/4" (?) hole through. Not a bit job to fit it. Just make sure it is very secure so you don't get flexure.
Btw if you have the extra reddies then you may want to consider a DMK21 for combo guide camera, planetary camera and DSO camera. The Orion filter wheel will work well with this (with an adapter) or you could try one of the ATiK 16IC (I have one and it's a fantastic little camera). Not a real shake for planetary but a great little camera for autoguiding and DSO.
http://www.astrovid.com/prod_details.php?pid=3246