The plastic assembly surrounding the pump pickup is very important to the proper operation of the oil pump pickup and nearly impossible to find the last time I needed one.
The "stupid" windage tray is part of the oil pan assembly and I'm not sure it's available as a part separate from the oil pan.
No offence, but based on all of your threads I recommend taking a deep breath and reconsidering if this is the right vehicle for you. The car has other "stupid" parts, some pretty rare now, and also other bolts that take a bit of finesse to remove.
I say this not to be mean or nasty, but to potentially save you a bunch of future aggravation. These are older vehicles and support is not easy to find.