Stock 1.6ers on the left. Arrows show from left to right: insulator, grommet, O-ring. I was told the insulators would crumble, they didn't! I'm going to return them (40 bucks worth). They say you should replace the O-rings, cough. I oiled them with Mobil 1, does that count? No leaks so far. Ok, now just reverse order of the other pix to put them back. 'Bout the easiest mechanical job I've ever done on the miata!