Lightweight Crank Pulley Opinions

[Clouse]

be sure it comes with a sleeve for the crank pulley. These pulleys usually are made of aluminum, and the seal will wear a groove in the pulley quickly and cause a leak without the sleeve.

I think I'm a little confused. Are you referring to a need for a steel sleeve on the inside diameter of the pulley? What exactly wears?
I have this exploded image of the 4d56 pulleys and I'm not sure where the crank pulley contacts any seals. Then again I haven't had my crank pulley off in a while and can barely remember how the crankshaft, timing belt, and balance belt pulleys stack on the crank shaft.

[Clouse]

Image didn't post for some reason... Attempt #2

BU5j13Y.jpg