I have the same exact spacers on Stern ST1's 19X8.5" and 20X9.5" These rims come with 35 mm offset and even after careful measuring the lugs I ordered were 2 mm too long. After I hung the tire/rims in back I SLOWLY rotated the wheel to listen for any noise. A faint "ching-ching" was heard.

I took an OEM lug and placed it in the OEM rear rim (sitting on the ground of course) and measured the projection with a caliper:

.650"

THIS IS THE MAXIMUM PROJECTION FOR LUGS IN THE REAR OF YOUR CROSSFIRE. ANY LONGER CAN CAUSE DAMAGE TO INTERNAL BRAKE COMPONENTS!

Removed the new wheel/ spacer assembly and did the same:

.740"

.090" longer (~2.3 mm).

I spent about 20 minutes on a grinder shortening the 10 rear lugs and chasing the threads. Works fine.

There is damned little room for error. I'm surprised more folks don't run into this problem.

Another little observation (here comes the engineer in me):

There are only 6 threads in the spindle. 6 threadsX1.5 mm/ thread = 9 mm.

Bolt diameter: 12 mm.

I don't care if the engineer is German, Pole or Italian, a 1:1 ratio is MINIMUM for strength. Adding a spacer (increasing the moment arm) is really stressing an already weak design. There is another issue concerning this, but I'll leave it alone for now.

Just my 2 cents.