[shotgun]

I just double checked, the uppers installed in My 78 Cutlass are also 10 1/2 on center and the lowers also came in at 19 1/2.

These are adjustible parts but match the length the stock parts I have sitting on the shelf.

Kinda got me stumped why yours are 11 1/2?

Also you don't need stock parts to check your lowers, just measure where they "would " be installed, should be 19 1/2".

Frame bolt to open hole on the rear.

The type of bushings/joints determine the pinion angle.

My rear is all hiems/sperical bushings (read NO PLAY) , it is set 1 degree down.

If you got Poly/solid mix go 1 to 2 down.

Poly only 2.

Poly/stock mix 2 to 3 down.

Stock 4 down.

These are starting points.

But we gotta figure out your arms first!

Just for grins, measure from front to rear wheelbase on both sides.

You can measure rim edge to rim edge.

The numbers it's self does not matter, if there is a difference it does.

So just measure from the same way on both sides of the car.