Burton5251

I was able to decode my trim tag with the exception of the "R" on the third line to the right of "AR9". Would anyone have any information to what the "R" represents?

Line 1:
E: Year (1984)
09B: Build Month & Week (September, second week)
1: Car Division (Chevrolet)
FP: Series (Camaro Sport Coupe)
87: Body Style (2 Door Sport Coupe)
L: Plant (Van Nuys)
257004: Body Number (257004)

Line 2:
11L: Body Color, Lower (White)
11U: Body Color, Upper (White)
Water: Paint Type: (Water Based)

Line 3:
17B: Interior Code (Dark Charcoal Cloth)
AR9: Seats (Reclining)
R: Unknown

Line 4:
D: Spoiler Option
S: Stereo Option
112552: Julian Date (11) & Plant Batch Code (2552)