Diagram reference number 1 in the image below:
" Fitment: 2005 TOYOTA TACOMA - 2 door

Application Notes: Exc.Air Cond; Routing:Crk,Tens,Alt,Ps,Idler,Wp

Category: Electrical, Charging and Starting

SubCategory: Alternator / Generator and Related Components

Position: General

Part Number: 9091602639


This is a Serpentine Belt that fits the 2005 TOYOTA TACOMA - 2 door with the 2TRFE engine. The Serpentine Belt is designed by TOYOTA to be part of the Electrical, Charging and Starting-Alternator / Generator and Related Components. The Serpentine Belt has a position on the vehicle of General. The 2005 TOYOTA TACOMA Serpentine Belt is a factory made TOYOTA OEM part and it comes with a 12 month 12,000 mile warranty (parts only). Do not be fooled by an aftermarket TOYOTA TACOMA Serpentine Belt! Buy a factory TOYOTA part and receive peace of mind!
This factory part has a part number of 9091602639.