Strange, when refurbed my sway bars I saw different P/Ns for the D bushings, stating they were different diameters. Maybe it's only the rear bar. I can dig a little deeper when I get home.
You are correct that the rear is different
Rear swaybar
48805-60060 (Same # 99-07)
48805-60090 W(ACTIVE HEIGHT CONTROL)
Looks like using a non AHC rear swaybar on an AHC vehicle could benefit a heavy loaded AHC vehicle.

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