Replaced most of my suspension a few months ago and had a similar problem
On mine, one wheel was miles out and the other was pretty much spot on.
What I did was drive the front end up onto a pair of ramps.
Next, I found a socket which (only just) fitted between the wheel rim and the shock absorber body.
If you have to literally hammer the socket into the gap then that's even better
Once you have the right size socket, remove it and shuffle your arse across to the other side and try to fit it in the same place
It will either be a slack fit or it will be too tight.
Next, find the 2 bolts that hold the shocker onto the hub.
Slacken off the top one so that its quite loose and then just crack off the bottom one a little.
Get somebody to either pull or push at the top of the front wheel until you can fit the socket in the gap as per the good side
Once its in there, tighten the 2 bolts up within a inch of there life's and remove the socket