dodgestang, I completely appreciate all the work and effort you've put in on completing your data base. It is impressive and a good general guide, but I still hold that the sources can not be verified as being 100% accurate. I'm not saying anyone that has provided info is wrong or lying, but there is no way for me to completely verify the accuracy of their statements. Are they absolutely sure they've got 600lb. springs, or did a vendor send them incorrect ones by accident? "Sure, the PO said the front brakes are original and that he installed normal height springs, so it must be right, right? Oh, and he said the car has never been in an accident..." Maybe, maybe not... without knowing the amount of knowledge and savvy any of the contributors to your list have, the info in your data base is best considered a indicator of potentials rather than a biblical source for final decisions. Heck, even your own reply above seems to indicate that it isn't a carved in stone kinda thing.
Ultimately, if I'm gonna drop $1000 or more on a set of wheels and tires, then I'm gonna spend the hour of time it takes to measure and know
for sure. And really, what is the big deal??? An hour of time and some measuring is all we're talking about here... a lousy hour... jack the car up, put it on a jackstand, pull the wheel, get a piece of string and a nail and couple good long straightedges and measure... one little hour to do both sides... maybe two if you're slow like me. Seems like a small price to pay for accuracy and reassurance...