I don't think i'd recommend using the old front mounts to align the new perches. I just installed my USCarTool kit this past weekend and I found the factory locations on the spring mounts were not square and almost a 1/4" off on my car. Which, my car has never been in an accident and has perfect rust free floors so I believe it was as it came from the factory. My spring perches were also 1/8" to the right side of the housing as well.
