I have the Alko's on my vanagon Westy and am very pleased.  I have run
bilsteins in the past and didn't like them as much though it was on a
different van.  I picked mine up from Bus Depot but they should be available
at other places.  For what it is worth my van's ride has gotten numerous
ride quality compliments from other van drivers and non-van drivers.

Jonathan Poole
'83 AC Westy