My front underbody lining is dragging on the ground. Does any know what that part number is so I can order and DIY?

 

Which piece? If it is the front (#1 - under the engine)..."Under Cover - Porsche (970-504-117-05)"

 

it is called the lower engine cover or splash shield (#1).
About 250 new.
You need to make sure you have all the hardware. If your lower shield was dragging, it is quite possible some bolts came out. So your new shield will need all bolts to ensure it does not start dragging.

 

You may also find that you can zip tie the current shield in place w/o having to purchase a new one. Get it up on a lift and find out why it isn't staying in place. My indy did this to mine and it's much better now.

 

The part number for my 2012 Base model is 97050411705

 

Bringing up this again, aside of the piece mentioned, Im unable to find in the PET the ones that connect to that one next to the front wheels, one per side. See image, any idea?

 

These are for 2012 to 2016 model year...

2012-2016 Porsche Panamera Fender Splash Shield 970-504-123-26 | Delaware Porsche Parts

2012-2016 Porsche Panamera Fender Splash Shield 970-504-124-19 | Delaware Porsche Parts

 

Not sure, it doesn't seem to be the same.
The one I marked and seen in my car is flat I believe...