Check the Green Field - right about in the center of the field a couple of KF club members set up a few spaces with lots of NOS and good used items. I've spent a few bucks there over the years.
KF stuff is getting harder to find at Hershey. Some vendors say that since so few folks are looking for Kaiser parts, they've just stopped bringing them. In the same breath, they also say that about any of the orphan makes so we're not alone.
My best finds usually come from newer vendors and most of them tend to be either in the Red Field near the stadium, or the Green Field near car corral entrance.
Happy hunting!