This page has chart for early cars through 2002.
CB-Racing, 986 Suspension Info
Using this info, on my 2000s, i went with the m030 S front bar and the m030 non-S rear, (since it was stiffer than m030S bar)
After that I installed ROW m030 springs and shorter sport shocks to lower the car a little.
Felt just right for track days and still street-able.