wheel spacers?

alright, i'm in a slight dilemma.

i currently have 315/35/17' BFG's on 17x10.5" 03 chrome cobra wheels on the back of my stang. I had the rear fenders rolled back in January or february because my tires were getting shredded.

I want to keep my cobra wheels but I want to put a set of drag radials on them and keep them for when i go to the track.

i've also been eyeing some CT-R GT4 Wheels, but unfortunately the idiots can't seem to match the supply up with the demand because the 18x10.5's are out of stock, and have been for the last 2 months with no hint as to when the next batch will be available.

On the CT-R GT4 wheels, I want to run regular street radials, as these will be my drive around wheels, show car wheels.

so since the boneheads over at CT-R don't have the size I want, and I really dont feel like having any more tires shredded or rubbing, what's a good spacer for an 18x9" that will put the wheel close to the fender lip, but not to where it will touch the tire? I like that filled out look, where the tires are pretty close to the outside edge of the fender. Will there be any problems I will run into with using wheel spacers? Is it safe? Will I hear extra noises when driving from the wheel spacers?

here's the specs on the 18x9's from CT-R's websites

18x9" Chrome/weight 26 lbs. /offset 24mm/ backspace 5.95"
 
I would run a 1/2" spacer with a 9" rim & a 1/4" spacer with a 10" rim on a 99+. I have 1/4" spacers on my Mach with 18X10's, & it looks perfect, but with how low my car sits, the rear passenger tire is slightly rubbing.

How did you roll your fenders & how good did it come out. i want to get mine rolled, but Im afraid of it damaging my paint....
 
I would run a 1/2" spacer with a 9" rim & a 1/4" spacer with a 10" rim on a 99+. I have 1/4" spacers on my Mach with 18X10's, & it looks perfect, but with how low my car sits, the rear passenger tire is slightly rubbing.

How did you roll your fenders & how good did it come out. i want to get mine rolled, but Im afraid of it damaging my paint....

well i screwed up and had my mechanic cut the rear fender lips into small tab-like sections and then he pounded them flush with fender wells so they wouldn't shred my tires, but if you get up close and look, you can see ripples in the paint, so I'm gonna have to have both my side rear 1/4 panels repainted and fixed. the body shop guy will cut the fender lips off, and then use bondo to round them off, so they won't cut the tires anymore. mine are peeling, but i don't mess it with and it's not noticeable. i'd take it to a body shop and have them use an actual fender roller, you'll get better results.

now on the spacers is the 1/2" spacer how much it's recessed into the wheel well from the fender lip? or is it how much extra it adds between the wheel and the hub?

I have the 10.5" wide wheels on it now, and they don't need the 1/4" spacer on there at all.
 
well i screwed up and had my mechanic cut the rear fender lips into small tab-like sections and then he pounded them flush with fender wells so they wouldn't shred my tires, but if you get up close and look, you can see ripples in the paint, so I'm gonna have to have both my side rear 1/4 panels repainted and fixed. the body shop guy will cut the fender lips off, and then use bondo to round them off, so they won't cut the tires anymore. mine are peeling, but i don't mess it with and it's not noticeable. i'd take it to a body shop and have them use an actual fender roller, you'll get better results.

now on the spacers is the 1/2" spacer how much it's recessed into the wheel well from the fender lip? or is it how much extra it adds between the wheel and the hub?

I have the 10.5" wide wheels on it now, and they don't need the 1/4" spacer on there at all.

The 1/2" is the amount of space the spacer adds between the wheel & the hub.