somewhere between 17 and 25 i believe. Some other size should fit, the way torx bolts are made, I've been able to use torx bits/sockets two or three sizes too small with no problems.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15