You can if you need to just unscrew the bolt that holds it to the quick release side of the brake and take it off then replace the bolt,best to use them though.....mind you the old manitou bikes did not have them fitted so ...........
I asked because there is a lot of trials companies making boosters.
a lot.
But most of it has spacing around 100 mm due to extra wide rims.
Maybe you could find something. Iwill try to look if i dont forget..
A fellow retrobiker,who shall remain nameless,helped me out by making this lovely carbon booster for me,it arrived just before my enforced holiday so I have not been able to report back but it fits perfectly looks cool and does the job nicely