I gather this is because you want to replace the turn signal bulbs with LED's right?
You might be able to find the connector that plugs on the turn signal light; but chances are pretty good one doesn't exist for the light side (because I think it's built into the light - or the car side plugs directly into the light). You may have to make your own jumper harness with the resistor included and the connector for the car side.
I'd think you could go to the Toyota parts counter and tell them you need the turn signal connectors and ask if there is a mate to them. Then ask if they come with the pins and sockets you will need to crimp on the wires. Then ask if they have the crimper for those contacts. Then ask for the insertion and extraction tools required to get the wires in and out of the connectors. May be more trouble than it's worth.
You may find some answers as to connector numbers in the factory service manual info posted by Nashman as a place to start. Each connector number should be able to be referenced to a part number. It may also depend on what year and model your 4Runner is. The manual info Nashman posted is for 2010 and it's located in the mods - write ups - .... Sticky.