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Enjoy.
This is a fantastic app!I found this to be a good calculator when I was trying to figure out all the wheel/tire possibilities for our cars. (I thought about creating a chart, but there were just too many variables)
http://www.rimsntires.com/specspro.jsp
Punch in the original wheel/tire specs (I've been told it's 185/70 R13 with 4.5" rims with -27 offset), although Bill, you could put in the Saab wheels' specs. Then punch in the proposed specs (I did 185/55 R15 tire on 5" width rim with the 0 offset). And here's the result I got:
Package 2 is 27 mm (1.1'') closer to suspension/brakes components. Make sure that you have enough room for that. If not, consider lower offset, narrower tires or using spacers.
MAN, That is some grand plumbing