Well I went to the local junk yard, they wanted $50 for this:
before I went I took of mine just to see how (so I could take the right tools)
needles to say, I did not buy a second one to mod!
Right now (including parts I need to order today) I will have about $30 into this mod. That might pay for it's self. $50 more, no way.
It looks like I will have to make it inside the grill. I think I will face the back side of the grate towards the grill. That will have the air pressure helping to keep the vanes closed. It also allows the actuators to be on the inside and out of sight. I will likely have to make a box from the grill to the grates to keep air from flowing past my dampers. there is about 8" from the grill to the radiator, so I have lots of room to work with.