"Trust me when I say, take your guitar to a local guitar store that should have a little box of trem arms under the counter. The MIM Strats have too many variations. Mine was all about trial and error. HINT: If your a trem user, have it set up right by a pro."

Actually, I am a trem user: or should I say abuser!
I love using a trem. Just seems to come natural to me.
It's the one thing missing on this strat: I find myself reaching for it and it's not there!
I think I'll take your advice and take it to my local luthier.
My first thought was to order a couple different ones and take my chances.
But it probably makes more sense to do as you suggest, and at the same time he can take a look at it and tell me what he thinks.

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2006 MIM Strat
Custom built Strat (from authentic strat parts)
2010 Ibanez RG4EXQM1
1966 Gretsch Chet Atkins model
numerous acoustics

Hughes and Kettner Tubemeister18 (awesome!)
Fender Super Champ XD

No straplocks ??? !!! oh my oh my.....

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2009 american deluxe ash stratocaster

2009 epiphone es-335 dot.
2009 65 drri amp
2009 fender vibro champ-xD amp.
2009 takamine g-4400 acoustic/electric guitar

1980 fender harvard reverb 1 amp

You cant beat that with a wooden baseball bat!

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Everything belongs to JESUS!

1998 Fender Deluxe Super Strat
2008 PRS SE Singlecut

Marshall MgHD100FX single
Line6 Spider ll
Crate Kx 15


Digitech GNX1
Boss DS-1 pedal

"strap locks???"

well....I've never used them.

_________________
2006 MIM Strat
Custom built Strat (from authentic strat parts)
2010 Ibanez RG4EXQM1
1966 Gretsch Chet Atkins model
numerous acoustics

Hughes and Kettner Tubemeister18 (awesome!)
Fender Super Champ XD

Got my trem arm today. $10, with the spring, from my local repair shop.
Now I am complete.

_________________
2006 MIM Strat
Custom built Strat (from authentic strat parts)
2010 Ibanez RG4EXQM1
1966 Gretsch Chet Atkins model
numerous acoustics

Hughes and Kettner Tubemeister18 (awesome!)
Fender Super Champ XD

I know what you mean about the trem. I have bought and sold a few different guitars and I never feel like they are complete till the arm is on them. I recently had my Korean Squire II in the shop and looked about having a locking nut put on cause I love to dive on the trem. The shop owner is a Strat player and said he could set it up to stay in tune and function as smooth as the floyd on my other guitar. Sure enough, he set it up and it plays like a dream, AND stays in tune. I play with 8's and it turns out you need to go down to 2 springs if your gonna float the trem. I used what I learned and set up my MIM Strat and now I have a hard time choosing which guitar to play.

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TOO MANY GUITARS, TOO LITTLE TIME!

Current Stable:
Fender Stratocaster MIM 07
Squire II Stratocaster MIK 89?
ESP LTD MH-100QM
Jackson KE3 Kelly MIJ