Try our re-instated info resource - "Aladdin's Cave" (Main menu)- sorry it's taken so long to fix
No, i said most aftermarket ones are thicker than oem but, not all
OEM, Vesrah, NP, NE with new pucks and measure up all the o rings
Yank word for the rubber pontefract cakes that cover the holes neede to get at head bolts between head and valve cover.