6.5 TD Flywheel

[Pelado]

I've found this flywheel, that the seller thinks it's a single mass one from a 6.5 TD.
Is there a way to be sure?
Does it have to have a counterweight in the back (this one don't)?
I'm putting back together this engine to replace the tired 6.2 in my Dodge M-37.
It was from a '98 Suburban with auto tranny, so the engine came with flexplate.
Don't pay attention to the Pioneer box, it's from another flywheel.

http://i232.photobucket.com/albums/ee136/WagonMan4x4/DSC02552.jpg

http://i232.photobucket.com/albums/ee136/WagonMan4x4/DSC02551.jpg

[NH2112]

Well I googled the part number and it came up as the flywheel for internally balanced small blocks & big blocks, which means it'll fit everything but the 400, 454, and diesels.