im thinking of uprating the front bushes and seen a set for front and rear wishbone and anti roll bar bushes and it says to state which size for the anti roll bar bush 17mm, 18mm 0r 19mm for 1997 impreza turbo 2000 uk so i need to know what size my standard oem anti roll bar is so i get the right bushes. only thinking of uprating as have bad inner wear on front drivers side tyre so got a new ball joint and tyre as old tyre wasnt legal anymore and old ball joint was a bit slack and knackered.

 

I reckon your safest bet would be to buy a cheap vernier and measure yours, it could be any one of three diameters.