Not positive, but I thought both base and lid were the same gloss. I think it was a little glossier than 60%. My air cleaner was an unmolested original. Too far gone to not repaint, but we found some areas that weren't faded, and the painter had some paint that seemed to match the gloss pretty well.
BTW, we taped off the original "REAR" sticker and left it on the sealing ring. It's yellowed and faded, and doesn't match the other stickers on the car, but I thought it would look cool anyway.