Nice knob
It has a nice feel. Delrin does pretty good in the hot and cold. Not sure that I like the much lighter weight though, it kind of loses that solid engagement feel that a weighted knob gives you. Diameter is slightly larger than stock.
I did have to use a thick washer to bring my boot up a bit as the knob didn't screw down far enough to secure the boot. Dropped it by a star due to the minor fitment issue.