I have just installed a set of Boge lowering springs on my '85 Westy,
2WD, and my initial reaction is favorable.  Sits a good deal lower.  As
part of the overall improvement package I have installed 14" factory
alloys, Kumho "C" rated tires, new shocks, and the springs.  I measured
from the ground to the bottom of the fender well, and these are my
measurements:
                     Before                               After
                RF    30"                                26 1/4"
                LF     29 1/2"                          26"
                RR     28 1/2"                          27 1/2"
                LR     27 34"                           26 3/4"

While it isn't perfectly level now, it sure beats the way it was
before.  I plan on trying shims to bring to true level.  The air lift
shocks I had bought in the group purchase will not work with the Boge
lowering springs.   Entering and exiting is much, much, easier. The ride
is much better, and the semis do not blow me all over the road, though
there is still some buffeting on some occasions. I have not experienced
"bottoming out".    Pricey, but the results seem worth the time and
expense.          Larry