Having been out for a "little spin"
in Spuds Roadster today,( decided we needed half hour of fun after a long week/weeks
) & i personally don,t think an anti roll bar is needed, maybe other manufactured cars need them to hide a design set up problem or overkill as a sales ploy, whereas the Roadster is a well balanced/handling car without the need.
just my opinion of course
cheers
andy