HCR went mad for some reason quite a while back & decided to concentrate solely on parts for those daft golf cart things. You might get lucky and still find them instock with certain retailers, maybe 2coolrc.com etc, but waiting for GARC ones would be the best bet for Ti skids, unless NewEraRacing have anything:
http://www.neweramodels.com/cgi-bin/...0&shortlist=1#