I used one of these at driver side rear:

http://www.gowesty.com/product/coil-springs/4346/spring-pad-for-rear-coil-spring-

Leveled things out pretty well. Your numbers don't look too bad though. Mine were worse.

Andrew

On Wed, Aug 15, 2018, at 8:47 AM, Jim. Felder wrote:
> I have a 1983 Westy with 2012 GoWesty replacement springs (normal lift).
> Almost from the time of installation I noticed the car wasn't sitting
> level, presumably because of the imbalance caused by the westy interior and
> camping equipment.
>
> The sag hasn't changed much in 6 years. Here's what it looks like. The
> measurements are from the lip of the wheel arches to the center of the hubs:
>
> Driver front: 16.5 inches
> Passenger front: 17
> Driver rear: 16
> Passenger rear 16.75
>
> I realize that you can't shim these springs like they were mechanical cam
> lifters, but that they are means of racking the car around the center of
> gravity as a fulcrum, and in the front the suspension geometry has some
> mechanical gain to it affected by the height changes in the rear. So, I'm
> not going to try to learn all that for what I hope is a one-time fix.
>
> My question is a) what are the best options for shimming and b) where to
> get the shims?
>
> Thanks in advance to those who know.
>
> Jim