I guess I should have done some more research before trying this. I love the 8 spoke Hyper Silver M35 rims. I purchased 4 of them off Craigslist, without proper research. I found I needed a minimum 1/4 in spacer in front and longer lags as you did.
My mechanic and I have tried everything but I cannot get these wheels to work with spacers. I end up with a hard "shimmy" or "wobble" at between 55MPH and 65MPH. Since you posted back in 07' and never got any responses you probably ened up with the same problem I have, they are not going to work.
Now I got to try to resell these. I wanted to stick with a OEM Infiniti rim but I wanted to go 18X8, I don't like my Anniversary Rims at all.
It looks like the only thing I've found on the net was right here on NICO.
fx-wheels-on-a-y33-t222883.html
Not Hyper Silver and not 8 spoke but what you gonna do. 03-05 FX wheels which re 18X8 with a +40 offset.
Strangef8
Strange8