Hi guys

My car has a small coolant leak, the fan is on when I am driving (not overheating though) and the service car soon message has appeared on the dash.  The garage says its the thermostat and housing which I need, which I had worked out too after googling the issues.  I don't want to get fleeced by Vauxhall again after just shelling out £850 on an exhaust so looking to buy one from elsewhere.

Can you knowledgeable lot advise if this is what I a looking for?  I put my reg in and it say