The usual "there 3 ST1100 models"... + some minor changes over the years...
ST1100 non abs '90-'00
ST1100 ABS-I/TCS '92~'94
ST1100 ABS-II/CBS '96 onward...
on my '94 standard I find:
91054MN8741, bearing radial, 6004DU
91257KA3711, DUST, SEAL 28X42X8
91258ML7003, KPH DUST SEAL, 45X55X5
ST1100AN/AP/AR (ABS-I/TCS, "angry aubergine" livery)
91054MN8741, BEARING, RADIAL 6004DU
91257KA3711, DUST, SEAL 28X42X8
91258ML7003, KPH DUST SEAL, 45X55X5
on the '00 standard:
91052MZ2A21, bearing radial, 6204DU
91252MC4003, OILSEAL, 28X47.2x7
91258ML7003 , DUST SEAL, 45X55X5
and the finale on the '96 onward ABS-II/CBS:
91052MZ2A21, bearing radial, 6205DU
91252MC4003, OILSEAL, 28X47.2X7
91258ML7003, DUST SEAL, 45X55X5
so somewhen '95~'96 both, standard and ABS-II, got the larger 6204DU bearings...