Which fork will fit my 05 Trek 7500FX?
The stock alum. looks like a MTB fork, Which is wat to big for the 700cc x 32 tires.
Was wanting somthing more like a road bike, nice and skinny maybe even carbon fiber!
Most road forks ar probably too narrow for 32mm tires. Better to stick with the fork you have. Besides, the rear stays are sized similarly and there's nothing you can do about that.
But, if you insist, you need to make sure the fork will accept your wide tires. You also need to find a fork that has similar rake so you don't mess up your trail (unless you want to) and find one that has mounts for V-brakes. Most road forks are designed for road caliper brakes and have no canti/V-brake studs.
If you are prepared to drop the dough (and it would be a worthwhile upgrade), there are in fact lots of options. Basically, you need a carbon (or steel) 'cross' fork with cantilever bosses -- lots around. These usually have around a 400mm or so axle-to-crown length, which is probably about what the stock fork is on your 7500fx, and enough tire clearance -- probably don't really want a true 'road' fork on a 7500fx. As it happens, Bontrager (owned by Trek) is now doing one, I think, in carbon. Can't do a link thingy, but just go to the Bontrager site, >Road>Components>Forks, and I think you'll find it.