Finally found a antenna that fits our SC430. 2006 Toyota Tundra antenna assembly. Part # 86300-AF020.
This is almost perfect fit and replace the power antenna that we use. Just don't use the holders that come with it and use the holders from the SC430 then you will get a flush perfect mount. The assembly is about 3 inches too long so you do need to cut the tube. You also need to secure the antenna at the base so it won't move afterwards.
Note: The antenna fits best straight up but you have to make spacer to secure to the body of the car. I bent the tube slightly since its aluminum, do not over bent it or it will break. Then I made spacers to fill the gap to thr holding bracket.
Reference to all these pictures here and you should have an idea.
Good luck all.

 

The Tundra antenna has a metal holder on the antenna, just put the body on a vise to secure the tube and gently tap the holder out. Once its off you will see a small bump that needs to file out to smooth, then use the black base holder from our antenna to replace it so that the colored outer base can be reused and fitted perfectly. You do need to use the chrome cap that comes with it.
The tube is about 3 inches too long so I saw it off. I bent the tube slightly so that it won't rub against the body panel from inside. Be very careful not to over bent the tube or you can tear it.
Now, the mounting bracket that comes with it needs to be modified to use. I flattened it and reshaped it to where I
can use it to mount and secure the antenna to the metal bracket in the car. I found a 2.5 inches long screw and 2 one inch thick rubber washer as spacers to secure it back to the hole that was used to secure the power antenna originally.
Now all you need is a stubby antenna to finish the job. I use the TRD stubby as Silver bullet used and it fits well.
There is no modification to any original parts at all so it's reverseable down the road, and it cost about $50 plus the stubby of your choice.
Sorry I didn't take any pictures of the install but it should be very straight forward and there are plenty of pictures here to reference from. Hope this help and happy install.

 

Good for you can you post the after install pics at least?

 

This is the antenna that came off the car and the holders that weren't used from the Tundra's antenna.





Here are couple of after installed pictures.