I asked the person selling those on eBay if he had any of the better ones, model #5333, and this was his response:
"Sorry, I just sell surplus and what I have I list. I have loads of unlisted/unsorted items, so if you are ever in St.Louis give me a call.
Cliff 314-913-7486 cell"
So how about those of you near St Louis call and see if he'll let you dig through the unlisted/unsorted items and find that treasure trove of the longer #5333 ground cones? From another exchange I had with him it sounds like he'd give a good bulk price.