OUI extended ethertype dissector

[zajpv76xaa () snkmail com]

I'm working on a dissector for a protocol with the OUI extended ethertype (0x88b7 defined in ieee802a), and a fixed OUI 
and protocol ID following that.  Can someone help me figure out how to use the ieee802a dissector to only dissect the 
packets I want?  The best results I've received so far are with dissector_add("ethertype", 0x88b7, handle), but that 
obviously dissects all extended ethertypes.  If I use heur_dissector_add, I don't know how to filter out only the 
0x88b7 ethertypes without completely reimplementing the ethernet dissector.    And I couldn't figure out how to use 
ieee802a_add_oui, or even if that's what I need in this case.  Thanks for any help you can give.

--Karl Bielefeldt
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