sewlow
Bitchin' Stitchin'
Not sure what a flare side is, so I'll assume you mean stepside.
Anyways, they should. They have the same dimensions in terms of mounting holes. And someone on here at one time said that the two end risers on a bench seat can function as a set for one bucket seat, so I would assume the same can be said for one set of bucket seat risers can be separated into a set for a bench.
IIRC, the inner risers on buckets are shaped different than the outers.
I'll check when I get home.