1971 Chevelle Body Number Plates ~ Oshawa, ON. (OS)

ST  71-13637 ~ 1971 Malibu Sport Coupe (unknown quantity)
OS ~ Body Assembly ~ Oshawa, Ontario, Canada
555860  BDY ~ Fisher Body unit number
TR  721 ~ Antique Dark Saddle Elk Coated Fabric (bucket)
6219  PNT ~ Burnt Orange, Tuxedo Black (lower-upper)
5B ~ Body Date - May, 2nd week.

Courtesy Paul Singleton

ST  71-13437 ~ 1971 Chevelle 2-Door Coupe (18,261 units)
OS ~ Body Assembly ~ Oshawa, Ontario, Canada
561648  BDY ~ Fisher Body unit number
TR  701 ~ Black Roma Cloth, Black Coated Fabric (bench)
6262  PNT ~ Burnt Orange (lower-upper)
6D ~ Body Date - June, 4th week.