Is there any difference between the 07 and 06 YFZ stock stems if so what are they?

i dont think so. they didnt change anything between 06 and 07

By changes I dont mean length etc .. Its about the clamp, My friend thinks they sent him a 07 clamp for his 06 yfz and the clamp is too short, It doesnt reach the bolts on each side .

might be from an 04 or 05

I think the 06 stems have a 7/8 clamp and the 07's have a 1 1/18 clamp

that is true they put pro taper on them