1991 Suzuki RM250 aftermarket handlebars

All of those you listed should fit i just bought a pair of pro taper handlebars for my 91 cr 125 and they fit perfectly. Just as long as there 7/8" or what ever they should fit.

if you have the stock clamps go with either pro-taper seven-eighths bars (look pretty good and they claim to be The Best) or the renthal off-road 7/8" (I have these, and am so far impressed.) Handlebars don't have to be bike-specific, only size and bend actually comes into play. One thing to watch for is on renthal's they are colored so pick what will match. *doh!*
Mike

Any 7/8" bar will work just fine.

On my 92 RM250, bought a set of Windham bend 1 1/8" Pro Taper bars, complete with the clamps/studs that go into the upper triple clamp, off ****. They had come off an 03 CRF450. The stud size was slightly different, but a couple passes with the right size drill bit through the rubber bumpers and cupped washers fixed it right up. Huge comfort/control improvement! As long as the 91 bars were rubber mounted, I would think you could do the same thing.

I initially had the Windham bend bars tilted too far forward. After "centering" them, they were very comfortable, especially when standing.