Will a ABS hub assembly fit on non for 2005 Buick la crosse?

No, an ABS hub assembly from a 2005 Buick LaCrosse with ABS will generally not fit a 2005 Buick LaCrosse without ABS. The difference lies in the ABS sensor ring. The ABS version has a toothed ring integrated into the hub that's read by the ABS sensor. The non-ABS version lacks this ring. Even if the bolt patterns and other dimensions are the same, the missing sensor ring will prevent the ABS system from functioning correctly. You'll need a non-ABS hub assembly for a non-ABS equipped vehicle.