It's for the 9" ring gear, W/disc brake rear, I don't know what the difference is between the disc and drum but it won't fit a drum axle. My shafts are the same length, 25-1/4" from tip to flange(the 4 bolt flange that retains the axle-shaft).

Here's ARB-USA's #
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2001Sport 3.0-Headers-Cage-RoofChop-NP231/D300-D44/ARB-Ford9/Yukon/3Link-37's+H1's-PSC Assist-108:1