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A lot is said below.  However I ended using the panhard rod.  My favourite would be the Mumford.  It'll have to weight for future development of the car.

OK.  Not a lot you can do with the rear of a solid axle.
Or IS THERE, "que twilight zone music......."
I'm determined to get the roll centre lower than the standard 300ish mm a standard panhard rod will give.
So here we go.

Panhard

Standard Height gives a roll centre of approx 200mm to 300mm.

Here Justin has it just about as low as you can go in standard rear suspension set up.

Gotta love the GAZ shocks.  Nice gold and very adjustable.  :-) 

I've got a set as well.

Panhard rod.

Note this one is mounted very low in the chassis.  The roll centre is the position that the panhard crosses the centre of the diff.

Wobble Link
Possibility

However not symmetrical.  Hmmm does that matter in this linkage?

Watts Link

Another Watts option

A horizontal link.

Mumford

Wow looks good.  Have to check the angles and lengths. Back to the research

 

Check out this sheet it's good stuff.

 

Another Mumford
Yet again another mumford
And a modelled schematic
And here is what I have come up with.

Gotta love the Mumford Link.

PDF Mumford

Turbo Cad Mumford

Auto Cad Mumford

DXF Mumford

 

 

Here be mine.

 

And here  click me.