Rim Specs for Lucerne CSX
 

I have an 06 CSX with 10 spoke chrome. I know the rims are 18 x 7.5 with a 51mm offset. Without pulling a wheel to measure, since I'm an apartment dweller away from home for a few years, does anyone know or know where to find specs for the backspace?

I purchased the car from a relative who got it from the GM Exec pool, so the rims are salt pitted from the couple of winters near Detroit. I want to look for options to replace the OEM, since factory OEM are $$$ and replacements are only $$...

Thx for any help.

Mark