Mini displayport to VGA resolution

I use an external monitor with my imac 27" i was using an old Tube style vga monitor so i have a mini DisplayPort adapter to VGA.. i just hooked up one of my LCD monitors with a native resolution of 1680x1050 but it does not seem to give me that option... I can choose 1600x1200 or 1920x1200?
I dont get why i could choose a higher resolution but not the one i need.. looks like crap at that 1600x1200..
Any solutions for this?
I did a bunch of googling and it seems to be possibly something with Lion maybe... People had the option dropped when they upgraded.
Just wondering if there is a solution.. Yes i could go out and buy a new DVI adapter but this monitor also belongs to another computer so i am also using a VGA kvm so i would have to go out and buy one of those too... so just trying to cut costs.
Hmmm i should try one of my 1920x1200 capable monitors...
Q

Ok tried a higher resolution monitor and it works just fine... but the size of the screen does not match up as well but i guess i will keep it like this for now. It would be nice if someone had a fix for this.
Q

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