These glass window panels get broken easily especially for tenants who do not take care of the place. These glass window panels are quite rare and were invented at a time where the concept of air conditioning was not there.
I had quite a hard time finding these glass replacement panels. I finally found an old school hardware shop which sold it. Basically, there are many sizes and there is no standard for the length of the panel. One house might be different from another house. I had to bring a sample of the panel and it had to be cut to the length I needed using a glass cutter tool. All were done by the guy at the hardware shop. The shop is located in PJ State, it's just opposite the Rojak Subang shop, next to Kyber middle eastern restaurant.
Each panel costs RM 5 per piece.