Mathew,
I bought the side-by-side mount from Ken Duzat. (Ken's Rings)
http://www.kendauzat.net/
I bought the mount X bracket, the slide & rings for the AT80 & I also bought the AT80 from him 2nd H.
The X bracket suits the CG-5 mount & the dove-tail which accepts the tube bar is removable. So you could choose one to suit a tube with a CG-5 or a CGE. This is also in a fixed position on the end of the main X bar.
The dove tail on the other end of the main X bar which my AT80 is in, is attached via a slot in the main X bar & so the AT80 could (if needed) be adjusted to suit cross balance.
You can see I've also mounted the ctrl box for my Feather Touch focuser on the bar as well.
Ken seems a nice enough guy, but I don't think I'd buy from him again.
I wasn't overly impressed with the quality & finish of the bits for the money.
In the pic showing the underside of the AT80 you can clearly see that the rings are miss-aligned. Also, he has used very cheap paint on the aluminium which scratches at the lightest touch.
I recently saw similar mounts & brackets at
http://starstuff.com.au/page15.html or
http://www.robincasady.com/Astro/index.html
These seem to be a little better made.
With regard to your offer of a cable YES PLEASE.
Please send me a PM with your email add & I'll send all the pics & details for cable.