Engine.bmp - for CFM Engines
EngineIAE.bmp - for IAE Engines

On the engine bitmaps:

UPPER LEFT NACELLE - STARBOARD ENGINE, OUTBOARD SIDE

UPPER RIGHT NACELLE - STARBOARD ENGINE, INBOARD SIDE

LOWER LEFT NACELLE - PORT ENGINE, INBOARD SIDE

LOWER RIGHT NACELLE - PORT ENGINE, OUTBOARD SIDE

Starboard is to the right hand side as if you were in the back of the plane, facing forward.

Port is to the left.