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I am a bit confused by question.Is it an HR36 or GR16?
Or is the GR16 the grate number?
Below is a link to the installation manual on the HR36.
Parts list including chimney sections with part numbers is listed on page 4
Details on chimney sizes is on page 6
If you have further questions, please let me know.
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If you know the length of the section you need to replace,based on the length, we can Google the part number locate the section. For example if it is the 24" section we would Google the SL324.Below is results of The Google search for that one.