There are a hundred ways to jack track together, but there is only one pattern of original track. So the original post, along with Stewart's, are for an item most of us crave.
I have had the original track jack myself, and would not want to use it to re-attach my track. They did tend to break if overloaded. The best thing I have found for use as a carrier track jack is one of the M113 Diehl track jacks, with the hooks slightly ground to accept the Bren carrier track. These have always been reasonably plentiful in Canada, and can be found as scrap at mil salvage yards, usually needing nothing more than a bearing.
http://cgi.ebay.ca/Military-Tank-Tra...3A1|240%3A1318
Stewart: If your price of $350 was in Cdn pesos, I would take it in a minute.