These gliders which were suitable for Sunflex Supreme tracks as well as Kirsch Regular and Double Duty tracks were discontinued by the manufacturer in 2009

Sunflex renamed the Supreme track as the Swish Ultrack and used the gliders from with the old Swish Metal Extendible track.

The following gliders are therefore a suitable substitute
Swish Metal Extendible Gliders
Speedy Fineline Gliders