2FS87 means it was built as part of the Firebird line-up, and all Trans Ams are Firebirds. They all have that.
Below that, WS4 is the Trans Am option. This is only stamped on Norwood factory car plates so you got lucky or you'd have to check the actual VIN in the windscreen. That's the N in the top line.
19N is Black vinyl interior
51L/51U is Goldenrod Yellow