Just received some Toyota OEM-style wiring harness connectors to add heated mirror function to my 4Runner. Toyota dealers (local, online) wanted ~$25 each for the OEM wiring repair leads (OEM metal fitting on one end, fits into empty slot in plastic harness plug.) Ordered 6 from Japan for $12 (including shipping). Chose cheapest shipping method and package arrived in 7 days. Company even emailed me a picture of the connectors packaged and the addressed envelope to make sure all was correct before shipping.
https://www.rakuten.co.jp/auc-hi-1000/ (Using Google Chrome, you will be prompted to translate the page.)