There are manufacturers in china that will make to order in what ever dia and length you want - https://www.alibaba.com/product-deta....29.114.vGPYpg
The knifecenter.com has 4 1/2" ones available for US$1.95 each and their shipping to NZ is very reasonable - Ceramic Sharpening Rod 4-1/2" - KnifeCenter - AC72
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