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79 XL / XR muffler - port config

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Can anyone point me to a research website or doc - related to the exhaust for a 79 XL 500?  I am certain that it's a 79.  And member ossagp said that an XR header will fit the XL which is great.  However, how far can I go in years to where it will still fit?  I'm fairly sure it's the same for 79-81.  But - can I run say an 84 header pipe on the 79?  I just to need figure out which years run the same header pipes. Thank you in advance.  

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