My wifes stock 400ex rear shock is pretty warn out....I have my 05 450 shock....and am able to get a 250R shock...both OEM...good condition. Is the geometry of a 400EX rear end the same as either of these quads...i think length wise could get them to work...I'm just wondering how good they would work on a stock 400ex swingarm with stock link.....or if they would not be good at all cuz they are not valved right....