Well after reading the how-to's on extending the rear flex hose needed to lift the rear, I never could find the part number for it online on any forums or the write-ups. I picked mine up from the dealer today so I thought I would post the part number if anyone needs it. This is for my '99 Tacoma 4x4, not positive what years it applies to, but figured it might help someone out there.

Straight from the packaging: 90947-02784