X2 Shieldarc. Gaskets never go outside as the first part of an assemble. You need the clear lens first (glass or plastic) then gasket, then dark lens of what ever type(tinted glass, gold lens, autodark lens etc) then another clear lens (glass works best for the back side next to your face)to protect the back of the lens from stray sparks. The glass not only allows for clearer vision but if a stray buckshot bounces inside the hood, it will usually stick to the glass and not ricochet back toward your face or eye like it does with plastic. If I use a cheater lens, I put it in last. If I have room, it goes behind the last clear lens, if not, I use it as the last clear lens. Most of them are plastic although I do have one that is glass and it does have a few buckshot marks on it. It would be great is someone made a hood with a deep enough pocket to put all the lenses and a cheater in properly. Usually they have to be jury rigged in especially on the AD hoods.