Part number : KPG0303 - flush mount or top mount gas cooktop.
Part number : ICG0303 - integrated in an 4mm inox worktop.

Burners(L-> R):
1x3.0kW Power burner
1x1.0kW Simmer burner
1x1.7kW Standard burner

Dimension cooktop : 830x405x4 mm in brushed inox 304
Dimension housing : 800x370x95

Downloads:
The dimensions of the cut out for the flush mount cooktop are listed in the general KOONAKA leaflet.