Hi Bruce,
Replacement parts for the Buckmaster are not that easy to find. My only suggestion is to keep a steady watch on ebay. They do show up from time to time, but they are not cheap. The last set of spikes that I saw on ebay went for over $60.
The Buckmaster does not have a strap around the pomel. It only has the strap that crosses diagonally over the crossguard.
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Honda XR350