Cooker switch replacement

Mum’s place is over 30 years old and unfortunately, many of the things installed in that house are worn out. Take this cooker switch for instance. This switch powers an oven and as one can see, it is cracked and worn out. This needs replacement but I am very hard-pressed to find such a replacement in Singapore. Looks like I need to find a way to get an alternative if I cannot find one. If anyone can tell me where to get one of these in Singapore, I will be very grateful