Fraser Johnston Furnace Age

Can anyone identify the age of the following furnace?

Brand: Fraser Johnston

Model: G8T06012UHA11A
Serial No: (S) WGMM031530


My chart says to look under York. According to the chart it is ether 1982 or 2003. You can call this number to verify.
Call 877 874-7378 or 188 231-4822

G8T models were made in the 2000’s…

it’s a 2003.

And the year is determined by the third letter in the serical number (M).

Thanks guys