vector blur seperate object

I found 2 was to blur a object, render layers and ID mask, but both seem to need the color mix . Is there a was to do this without the color mix , or a different way to do it, or a way to use the mix without it changing my colors. Every setting I use in the mix changes the colors some.
Thank you
Opps posted in the wrong spot. humm ?how to move it?

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Use the Color>AlphaOver node.