axle out of parallelism

yesterday I've do allignment and I've discovered that the axles are out o parallelism, the distance front/rear on the driver side is shorter of about 1/2" then the other side.
Anyone has the same issue?
I guess previous owner had an accident on the driver side (the vacum reservoir in the left side of the bumper is missing).
The only solution seem to buy upper/lower adjustable arms, do you have other idea?

my jeep is like that

i just drive it, 1/2" and it doesnt pull, doesnt wear the tires funny, so doesnt bother me

my one pull and wear the left tire badly.
Now with a bit more caster (7 degrees) pull less, but I'm out of pinion angle.
The strange thing is that it pull on the right also if the axle is oriented on the left???
I guess I've to visit my friend that have a reference table...