Those bars in that link are not even close to being 250r bars. I am a big fan of the stock bars on an atc and most of the ones I have bought are from someone parting a trike out on ebay. Just beware, they are all listed as "Strait" but almost never are.
There was a guy selling new reproduction bars on ebay that looked pretty good. The price wasn't bad. More than used ones, but less than the renthals. The Renthals just don't look right to me on a trike and I also don't like having a cross bar on a trike.
There are two sellers on ebay that I trust for trike parts, although I haven't been in contact with either one for a while, it might be worth a search. One is "cycle guy 79" (or it might be 75). The other one is "Clean motorsports". Both these guys know witch parts are the right ones and won't screw you. Clean motorsports is a member here, he goes by "Mr. Clean".
YAMAHA 450 HYBRID
85 350X- RED
85 350x -BLACK
86 350x-WHITE (with Goki)
85 250r
83 atc 70
84 atc 70
84 atc 110
09 yfz 450
2006 Arctic Cat Prowler
RZR XP 900