General Motors G Body platform models were assembled in several plants.
The assembly plants are represented by the eleventh character of the VIN and by a three letter RPO code.
These are the most common assembly plants for G-bodies built after 1982.
(RPO) (Location) (VIN Character 11)
ARL Arlington TX R
BAL Baltimore MD B
FFL Flint MI H
LAB Lansing MI M
PON Pontiac MI P
STE St.Therese Ontario 2
The Turbocharged Buick Regal was exclusively built at the Pontiac MI assembly line in 1986 and 1987.
1984 and 1985 turbo Regals were built on both the Flint MI and Pontiac MI assembly lines.
1986 and 1987 Pontiac assembled G-bodies also display the code FFL because the main body units were assembled in Flint and shipped over to Pontiac for final assembly.
As a side note some non PON and FFL cars also have the FFL code although it is unknown why.
All GM vehicles assembled in GM owned assembly plants also have the GMD code.