I looked at the ones I have on display and did not find one. I have more in boxes, but my guess is that I don't. I did find one quite similar in this Gropper top assortment box:
The one with those colors has a ball tip, but others on the assortment have the pointy rivet tip, so I'm guessing you might be looking for a Gropper top. Are you trying to complete a box?
Note the the drawing on the box shows three tops with rivet tips and only one with ball tip, while my box has 2 and 2. I imagine there were variations in the original assortments. But it's also common for sellers on Ebay (or possibly collectors) to refill the boxes with other tops.
