You can get two of them in the Lego Dacta hubs & tires set (# W779899) for $6.50.They used to be quite common--I have quite a number of them--in "regular" Lego. (URL) Wilcox Senior Web Developer iMcKesson Provider Solutions Group-Needham 160 Gould (...) (24 years ago, 19-Sep-00, to lugnet.robotics)
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