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You only have to remove the 4 bolts holding the GFD CV on the engine side attached to the crank pulley coupler plate…

many m1123’s were reset, they could have gotton whatever serp setup they put in between the 2. early or late style regardless of SN range. But for the most part, 99-2000 you will see the early. ive even seen early early ECV M1113 with old style.

You have the clutch pulley...12469149-3 https://www.hummerpartsguy.com/BELT-SERPENTINE-196901-ABOVE-114-IN_p_16133.html

And it makes no difference on SN for the serp setup, you have either old style serp that uses a plate, or the late style that is all mounted on cast iron brackets. The late Style is on many many M1123’s and M1097A2’s, but many of the early series use the old style. The geared fan drive REV...

There are 2 belts, and it depends on if you have clutch or non-clutch pulley on the 400amp. if it’s the clutch pulley, it’s the standard belt 300k and above....not sure what it is for solid pulley, but the belt is about 1-1.5in longer.