Yeah the water pump and power steering belts are different size belts. The alternator pully uses the OEM belt. The kit I bought came with the belts (most all kits do) so I didnt check for sizes etc.
Current standings: 98 M3 Track car
Mods: suspension, i/e/fly only
1/4th mile: 13.7@101 on 235/40 streets
Rd Atlanta: 1:44's on RA1's, 1:46 st.trs
95 M3 3.2obd1