Sorry can not have trolley MT-3000 with adjustabale flange width!
To have MT-3000 on I-Beam 600*190mm, trolley will be designed with fixed flange width by 190mm.
Trolley should be re-designed due to consideration on body strength for change on flange width except 190mm.
The requested flange width less than 190mm is not ok for this project, trolley wheel should be too closed to I-Beam and there is no enough space for trolley on base of I-Beam!
Please double check and confirm by return with decision on trolley flang width.