I'm looking into this now for my 2004 4runner. Looks like there is a difference before and after 8/2004. I pulled this from Toyota's website.
Part Number: 4420035061
Supersession(s): 4420035060; 44200-3506
Steering. Gear. Assembly, Power. Rack and Pinion Assembly.
Complete Assembly. Includes: Outer Tie Rods. Rack and Pinion Assembly. To 08/2004.
Link:
https://parts.lakelandtoyota.com/p/T...420035061.html
Part Number: 4420035070
Supersession(s): 44200-35070
Steering. Gear. Link. Assembly, Power. Rack and Pinion Assembly.
Complete Assembly. From 08/2004. Includes: Outer Tie Rods. Rack and Pinion Assembly.
Link:
https://parts.lakelandtoyota.com/p/T...420035070.html