I bought just the front and rear main seal driver. I think the whole kit comes with both seal pullers, both seal drivers, and the flywheel holding tool. I can hold the flywheel just fine with the engine out of the truck, so I don't need the flywheel holding tool, and I can get the seal pieces off the crank and out of the front cover/flywheel housing without the seal pullers. The part number for the front main seal driver is J-44645 and the part number for the rear main seal driver is J-44642. Both tools are manufactured by Kent-Moore.