http://www.mcfarlane-aviation.com/Products/?CategoryID=124&ID=29063315&PartNumber=MC0543022-4&http://www.mcfarlane-aviation.com/Products/?CategoryID=124&ID=29063315&PartNumber=MC0543022-3&Be careful about buying used ones, especially on eBay...
You may get lucky, or else end up buying some one elses junk.
You might find them at a salvage yard, but if going through all the trouble of replacing them ( you'll probably want to do the boots as well) I would recommend installing new ones....
