How to replace the Seals for the Oil Cooler Housing?

Thanks. Am I going to get new gaskets and if so which ones? The first image is cut off at the top could you tell what it is? Where did you find these instructions and images? I could not find anything online.

So, it looks like 2 gaskets will need to be replaced. Exhaust manifold gasket. Then 1 at the bottom to where it connects to the Exhaust pipe (blue circle)? I don't know what the gasket is called or if it has a part number. Do you have information about it? Also is it possible to disconnect this portion of the Exhaust pipe at the connection circled in red?

Hello is anyone able to help me with this part of the job?

I removed the screws attached to the bolts in the front part of the exhaust but I can not find room to separate it from the part above it.

After sliding the exhaust hanger, there was flexibility with the front end of the exhaust. With help, we were able to remove the Manifold and Sub-Manifold. We tried to remove the seals and gasket of the Oil Cooler Housing without draining the coolant, but the larger O-ring had turned really hard, and it was difficult to remove. We had to chip away at the O-ring and carefully scrape away harder parts. Used some cleaner to help soften those parts leaving residue. This Housing must have been leaking for a long time because there is a lot of oily sludge to clean up. I think since we have everything exposed. I should replace the 2 hoses (bypass hoses). Is there a part number for these hoses? One of the local Toyota dealerships had a difficult time finding the hose. They ordered a set that they think are the proper replacement hoses. The picture of the Oil Cooler Housing has the new O-ring and smaller gasket.

Okay, I'm back the Oil Cooler Housing. Unfortunately, I had to stop working on this project but I'm ready to finish. Is there a torque spec for the small bolt holding up the Housing and the large bolt mechanism that goes in the middle of the Housing?