This is a block off plate (or template for someone to make one out of metal if preferred) when doing an auto to manual transmission swap. This particular design is for the Nissan B13/B14 90s Sentra/200sx/NX....etc. Probably should work for a few others, perhaps G20s.

The hole is where the cable for the auto trans passes through. In the 5 speed that hole is blocked off so if you are converting, you'll want to seal off that hole.

I printed this in PETG. This is located right behind the heat shield above the exhaust so I dont think PLA will cut it. You can also use TPU to make a gasket to fit behind the plate and car......