Need Help With Measureing

[Break n Bones]

Ya hoo I got my hardtail frame today , Its a new 06 GT Aggressor , I tried to find specs on it like headset size / seat post / bottom bracket but... nothing , Not even on GTs web site so I had to wait till the frame showed up to check , Lucky for me the seat post was the same size so I got the post and collar to work but here is where I have the problem.

I wanted to run an old set of Manitou efc`s I had laying around but worried about the steer tube size ( parts no longer made ) I think the head tube on the bike is a 1" 1/8 it measures 1.330thousnds

I have 3 steer crowns , The one on the left is about the same size as the head tube , The one in the middle is TOO big and the one on the right is 1inch threaded ,

Now Im thinking the 1inch threaded crown would be the one for the 1 1/8 headset ...IS this right ?
Im trying to put this together on a tight budget so anything I got Id like to use.
I need to know about this so I can get a headset ordered .

Thanks

Oh and it came with a bottom bracket installed

[tkblazer]

if the headset is 1 1/8" than you'll need to use a 1 1/8" steerer tube as well.

[Break n Bones]

Originally Posted by tkblazer

if the headset is 1 1/8" than you'll need to use a 1 1/8" steerer tube as well.

Ok make scents

This fork was on the old chumba and it had some kinda reducer but I cant remember the size , I think its 1 1/8 I just dont remember