Idler arm problem? Please help

I think I have figured out that my steering items are correct, but my oil pan is not correct. I believe I need a #893 oil pan. Does anyone have one, or maybe I should be looking for something aftermarket.

The next question is: Can I replace the oil pan with the engine in the car? Or do I need to pull the engine up to get the pan to clear?

Any other easy fix here?

Thanks, Mike