This fan is made to bolt right onto the KTM RFS bikes. I have one on my 2005 450EXC and love it. I bought this one to use as a auxiliary on my 2007 ktm 640 adventure (I'm running dual cooling fans). With a little work, this fan bolted to the right side radiator on my 640. I'm very pleased with it. It has a high quality Spal fan.