GM / Pontiac revamped their dealer code system in '87. Dealers after that usually fell outside the alphabetized system used previously, and some zones were consolidated into others; Zone 11 is one of those : it continued, but new dealers after '87 were put into Zone 10.
R L Brookdale Motors did have 2 numbers : 15 102 & 15 017. 102 was sourced off a '79 build sheet and it 'right' alphabetically. 017 came from '90 documents, and has it sitting in the 'And--' section.
Dealers who had no name / location / ownership changes kept their pre-87 numbers until such happened- no one was automatically renumbered. R L Brookdale must have had something change in ownership.
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