If you want to make your own table-top and need a ¾in mitre track, you can buy the aluminium extrusion separately with a silver anodized finish in 1220mm lengths.
The profile measures 30.5 x 12.7mm with ribbed sides to ensure a tight fit and improved gluing surface area. It can accept t-slot as well as standard ¾x⅜in mitre bars.
Also available is 457mm (18in) long silver anodized mitre slider for making your own jigs to suit all standard ¾x⅜in mitre slots, including most cast-iron table saws. It has three mounting holes along the length of the bar to adapt for most jigs easily.
It also has four nylon screws in the side of the bar that can be used to expand the overall width of the bar and remove any side play in incorrectly machined mitre slots as well as reducing friction.