Bestter Dual Flush Toilet Push Button ATS 7637. This high quality Bestter push button is a direct replacement for your current button. It is 39mm x62mm to fit in a hole which is slightly larger than this. Note, the distance between the centers of the acutator rods is 26mm. Rods end around 220mm below the cistern lid but can be cut down to any size shorter than that quite easily with a pair of pliers.
This button can be used as a replacement for the Fowler button of the same size. If your button and flush valve look like the ones below, and your flush valve looks like the one in the pictures, then you can use this button as a replacement.
***PLEASE NOTE!! This may not be exactly perfect, but we are told that it can be made to fit with a little persuasion.