From what I recall with mine, there is no adjustment on the diagonal bar. Therefore as long as you do not load up the suspension whilst they are changed, there should be no issues and the new ones will match up perfectly with the bolt holes. No reason alignment should be affected. If you do add any other protection, make sure that the area for the washers and bolt holes are left clean as any layer of paint of other material can cause the bolts to loosen after a while.
