what's the oem 92-95 eg si diameter? i'm looking at a jdm one which is 20 or 21mm so i wanna know if it's worth it to buy the jdm one

 

Front Sway: 22mm
Rear Sway: I don't think they came with one, but if they did, it's probably 13mm or 14mm (I think..)

BTW, if you go with a thicker rear sway bar, it's recommended that you reinforce your subframe to prevent tearing it.

 

so then the oem and jdm are the same diameter then?

 

I would go with an LS or GSR sway bar they are cheap and the same size as an ITR.