I see what you mean. Unless the GAZ coilovers also have the thread inside the strut, I can see why the BC's are wider in that area.I currently have GAZ gold coilovers on the front, that section of the body looks a lot narrower than the BC's. On one of your pictures (maybe the angle) the Laguna hubs looked alot wider in this area.
Yes, the track is increased with 12 mm per side. I specifically asked PMS if I should use wider shafts, but they assured me I could use the original ones, and I haven't had any issues.Oh also. I believe this setup widens the track 12mm (I'm not sure if total or each side) I see you noticed it was wider.
Are you using the same driveshaft? And if so have you experienced any problems with them and the increased width?