First off, welcome to Mud! ************
The pins and plastic connectors are indeed available individually from the dealer, but you need to find the right dealer (PM cruiserdan or gotmud on here, as the both sell Toyota parts at great discount to us Mud folk. They are also very knowledgeable about LCs)
You will need to know the 5 digit code printed somewhere on the plastic connectors, as this identifies the plug. Then, if there are any different sized pins, make note of how many of each you need. If you can tell one of the aforementioned parts sources that you need X big pin splices and Y small pin splices for connector 12345, they should be able to help you out.
Hopefully someone with an A442F can help you out with the codes.