You can find the installations on this page https://www.toyotapartsprime.com/oem/toyota-pu06012115p1.html . There's a link to the instructions under the product specifications. The instructions are up to a 2019 model but they should be give you an idea of how to install them. Hope this helps.
Got some OEM mudguards on Black friday and finally installed them. They fit perfectly and I got a nice deal so I'm really happy with my purchase. I work a lot of hours so shopping online is very convenient for me. https://www.toyotapartsdeal.com/oem/toyota~corolla~mudguards~pt769-02090.html
You can get OEM Toyota shock absorbers for the price of an aftermarket brand. https://www.toyotapartsprime.com/ is my go to source for everything OEM Toyota.
https://www.toyotapartsprime.com/ is a great source for OEM Toyota fobs. Their low prices are cheaper than dealer. Most of the time you will have to take it to the dealer for programming. Some locksmiths can also program it for you. Hope this helps
You can try ordering those OEM Toyota part numbers from https://www.toyotapartsprime.com/oem/toyota-wire_engine_room_main-8211102d41.html their prices are cheaper than dealer prices. Hope this helps.