Skids
- Skid Row Off Road (Only works for 01-04 for 3, the front skid works for 01-07).
Front/Rear bumpers
- Local Fab Shops
- Brute Force Fab (Front + Rear)
- ARB Sahara (Front)
- Coastal Off Road (DIY + Front / rear)
- Lampson Fab (DIY, Front + Rear, but rear doesn't come with arms, and it's a big DIY approach).
- Move Bumpers (Front)
- Addicted Off Road (Front).
Molle (3rd row)
- Rago Fab
Lifts & Stuff
- 1st Gen Off Road
Roof Rack
- Sherpa (prinsu style, aka alu plate + 1020 bars).
A lot of people usually just make custom stuff for their on Sequoia.
Aftermarket support is low, and I don't think many more options will be added any time soon, as I think companies would rather work on the 3rd Gen Tundra.