Just bought an engine cover for a RL from SkyPainter. It is black with insulation attached to the cover. My 2007 RL has a gray engine cover with no insulation attached to the cover but there is insulation on top of the engine. So, I guess early RLs had a gray cover and the later RLs had a black cover with insulation. I think I may use the black cover on my RL for it looks better. I love stock. Oh I bought the extra cover for my garage wall decoration. RL wall graphic, engine cover and two exhaust tips. Looks great. Have to post pics.
2007 Midnight Blue R/L w/Tan Top
Manual 2 Tone Interior
2005 Crossfire SRT-6 Roadster
2005 Cadillac SRX North Star