I believe that S-spec RoW 030 front sway bar is 24mm thick,the Eibach is 24mm thick as well. Ordering the RoW 030 sway bar with bushings is a lot less then the Eibach,just something to consider. Now for the front your best bet is 2.5L/2.7L RoW 030 sway bar,the Eibach rear sway bar is the same as the S-spec,which is smaller then the 2.5L/2.7L RoW.
You may want to take a look at
http://www.cb-racing.com/boxster_030.html
http://cgi.ebay.com/ebaymotors/EIBACH-ANTI-ROLL-KIT-SWAY-BAR-PORSCHE-BOXSTER-97-03_W0QQcmdZViewItemQQcategoryZ33592QQihZ015QQitemZ 250152670518QQrdZ1QQsspagenameZWD1V
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-99' Zenith Blue 5-spd...didn't agree with a center divider on the freeway
-01' S Orient Red Metallic 6-spd...money pit...sold to buy a house