I went to Dmax's site & they aren't listed anymore. Even a google search that finds the URL ends up at a dead end on the site.
Either Dmax stopped making them or they are changing the design. The fact that you still had to press the ball joint in was a pita. The UCAs used the bolt on design & it was a pleasure to work with when replacing bad balljoints.
Even if your client wants you to chase them down, find out why he wants them. The stock design will not fail. If the LCAs fail (break or even just bend), a lot more of the vehicle will be destroyed. I believe they are arguably one of the strongest parts of the vehicle, period, even in stock form.
For the $900 Dmax Store was asking, he can get adjustable shocks or a ton of other goodies, or just pocket the money.