Based on Losmondy website it seems the dovetail should work on Meade products. refer to script below form the website.
http://www.losmandy.com/secondary.html
The Dovetail Plates are the heart of the Losmandy Secondary System. 0.5" x 4.0" x length of the tube assembly. Dovetail Bars may be mounted to the top and bottom of tube assembly for mounting of all D series accessories, making it possible to use both sides of tube for equipment. Mounts to all Astrophysics, Celestron, and Meade systems. The dovetail plates, like all accessories in the Losmandy line, are machined for lightness and rigidity from aluminum stock, then black anodized for a tough, corrosion free surface.
The second measurements seem correct. can you ship this to Melbourne ?