Danny installed a 3400 series engine cover on his base model Impala.

He ordered an engine shield that was for a 1996 pontiac transport van.  The dealer's drawing didn't indicate a logo, but as you can see, it has markings similar to the the 3800 cover.

The part numbers are:

24504184 f-shield (cover) $28
24504832 f-tube (oil filler extention) $12 (or so)

The dealer may say you need the rubber gaskets, but they are already part of tube and existing oil cap.

  Sidney installed the same cover on his car.  However he covered the numbers with painting tape and painted the shield black with a Ceramic paint used for engine blocks.