52400-MZ0-003 was used on 97' and 98'. 52400-MZ0-A41 was used from 99' thru 03'. Both numbers fit the 1500C standard and 1500CT Tourer as the hardware to bolt them on are the same. The Interstate shows a completely different #.
'99 thru '03 were re-valved like the I/S units for a smoother ride. The spring rates stayed the same as the '97-'98 shocks, as far as I could find out.