Here's the Poncho Dealer Code/Zone search site I use..
Scroll to the lower area to search...it's free too!.
http://www.wallaceracing.com/dealer-search.htm
Since 307 is a wonky Zone # using the 992 Dealer # only first results in a few hits in NC and OK?.
Also Zone # 07 Dealer # 099 Jim Causley Pontiac Detroit MI is the closest I see?.
Knowing you Dealer name would obviously help but if you don't, play around looking for Dealer codes w/ part of the # also using Zone # 07, 30, 37 or whatever and see what you can come up w/?.
Good luck!.
~ Pete
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I like real cars best...especially the REAL real ones!