Jay -
I would if I had the time and money....I'm that nice a guy.
After all, it IS his birthday.
Seriously...there's nothing to prove about the size tires, go the the tirerack.com banner above, and search for the specific tire you are getting/have, and it will list the dimensions....go to the driveway/Parking lot, etc...and measure the wells.
The questions are down to:
1. Does he need a lift to mount the tires?
2. Will the tires rub so bad he can't drive it around?
3. Is the size he's looking to mount only a fraction of an inch in any one direction larger than the largest stock tire size?
4. All pre-'05 X's front tires hit on part swing, as the rear of the front tire whacks the back of the well at the plastic mud flap ledge, if the tires are larger than stock, and the solution has always been to trim off that section of the ledge to let the tire clear as it swings by....is it the same on the '05's?
5. Is what ever hits going to move out of the way if the X is lifted?
6. Is what ever hits going to be back in the way under compression, if it cleared at ride height?
7. Will a BL solve 6.?
8. Will 33's fit well enough to drive around until the lifts or other solutions are available?
I believe the answers to all of these will result in 33's fitting on a stock '05...back in 2003, when I was at the press release of the new X, I measured the wells, and there was enough room for 33's then.
As we have some people that have mounted 33's on stock '05's already...as far I I know, with the OEM rims, they fit.
If people are running aftermarket rims with less than the stock backspacing, then all bets are off, and any tire can rub on compression, etc.
Plan B/Failsafe:
Go to tire shop, and try the ones you want on for size, if they fit, HAPPY BIRTHDAY! If they don't, trim what hits, and enjoy...or, get a rain check from the wife, and wait for the BL/SL or what ever will fix it.
The shop I use lets me test tires before buying, try on for size, and trim offending plastic, etc...and most shops will be willing to mount to check for fit.
The only shops that are a PITA are chains that will not allow their staff to mount any tire other than an OEM replacement, etc.