Replacing Kitchen sink unit

[dugit]

My present kitchen sink unit is showing signs of wear and I am thinking of replacing it. I would like to replace it with one of identical size so that I would not have to have a new work top which is OK..
The present sink unit I originally bought from MFI and the information I have on it is that it is an AINSWORTH GREEN SINGLE BOWL SINK SIN7150.
Would anyone know where I might purchase a sink unit to replace it?