This company will make them if there not already I have a couple radiators done from them.
http://www.ebay.com/itm/ASI-PROCOOL-40mm-FOR-SUZUKI-LT250-LT250R-aluminum-radiator-86-87-88-89-QUAD-/291214676075?pt=Motors_ATV_Parts_Accessories&hash=item43cdbf506b&vxp=mtr

I bought one of these. Great price and cools a 500 no problem....after I had the mounting brackets cut and rewelded to fit correctly.   Even with the fit issue still a bargin deal.