I think they may help on a P30 chassis, but were pretty much useless on WH.
They don't make any contact up front due to ride height of existing suspension, so never really come into play.
I bought two sets, one for me, one for a friend. He installed his before I got around to mine, and based on what we saw/experienced, mine are still in a box in the garage. Wish I'd saved the money and gone straight to new shocks.
Jim
p.s. They're available ;)