Inner rocker part #

I need to get my the area behind my rockers welded for inspection (picture attached is not my tacoma but shows the area where rust is). Is this part called the inner rocker? Part number 57412-04020? Want to make sure before i go buying the wrong stuff

 

Here is a picture of my truck, i also need to find out what that part is called attached the inner rocker at the front that is just a hole now. If anybody knows info on the right panels or if theres anywhere i can get them for cheaper than 350 per side that would be great. Any help appreciated

 

Looking at the join between the inner and outer rocker, you might want to look at having them both done at the same time - that outer is not far behind and it will be a heck of a lot cheaper in the long run to get them both done at the same time, rather than patch the inner and then in a year or two do it all again for the outer.

 

Yes i was thinking that as well, but as much as id like to i dont really have the funds for that right now. I just need it to pass inspection next month as this truck is how i make my money