You can also visit Ejaz Autos, or 1s dealers for Toyota in Kamran market, Rawalpindi Saddar. However, do keep in mind that the shop which will be selling 100% genuine and original OEM parts, they will of course not be cheap.
Now a days, there is a lot of fraud between spare parts, and for a layman like me, it may be difficult to judge which part is genuine, and which is fake. So exercise caution while buying parts and selecting a shop.