I used the injectors from Motor West. I have a 2000 Limited 4wd with 310k miles. I started experiencing some misfires and narrowed it down to one injector. I wanted to replace all of them at the same time. Noted issues with the OEM brown ones so looked for a better solution.
Here is the link for the Denso ones I used and extremely happy with.
Denso Fuel Injector Upgrade Set for 3.4L V6 4Runner Tacoma and Tundra – HP831 – MotorWest Performance