I've spent some recent time trying to find replacement caps for my daughter's Fair Lady. Her white ones were brittle and cracked. A guy on Ebay wanted $15 for a set, but I didn't want to spend that, so I looked for alternatives. The first solution I tried was a rubber foot. It looked ridiculously big. Then I tried these caps and they match almost perfectly. I just ordered a second box for some other bikes.
http://www.ebay.com/itm/Tip-Leg-Fur...043&rk=1&rkt=1&so=lastwatched&sd=391174915403
http://www.ebay.com/itm/Tip-Leg-Fur...043&rk=1&rkt=1&so=lastwatched&sd=391174915403