I just picked a set of used brembo's also. I like my stock 18" bullets and my tires are in good shape too. I am going with 1" spacer's from mustangwheelspacers.com. I went with the works package to bring front and rear both out 1 inch. Here is a picture of a car with a 1 inch spacer...I think it looks pretty good. Anyway, if you like your stock rims, you can keep them if you want to.
I hope you are running longer studs with those 1" spacers... Otherwise, you are probably getting 3 or 4 threads in those lug nuts.
Off of the website:
Our studs are what really make us stand out from the rest. Competitors use a generic one-size-fits-all approach. MWS duplicates knurl pattern and size so that your OEM hubs do not need to be modified. Use our removal and installation tools to make short work of removing OEM studs and installing new longer studs.
Studs have a longer shoulder for added strength and shear resistance.
Stud are made from chromemoly material and then heat-treaded to 190,000 PSI tensile strength.
Phosphate and oil protective finish for excellent corrosion resistance.