Didn't go the blendmount route. Saw where some found a very cheap alternative.
Went to the local bike shop, they had tons of these in a box, free for the taking. Not for resale. Cant beat that price.
Didn't go the mirrortap route either. Cut the end off a old telephone cable, soldered onto the bare wires about 3/8" of the legs off some LED's I had laying around so I could insert into the back of the connector at the mirror. This worked and had the detector hanging below the mirror but I wasn't satisfied. The detector is too low for my taste.
So abandoned the reflector arm mount. Fabricated a piece of aluminum to go between the window and headliner, attached at the point where the sun visor clip screws to the roof. This puts the detector right up next to the window at ahead of the visor. Still tweaking the placement but I think I am going to be happy with this location. Still used the power tapped from the mirror though.
I'll attach pics once I settle on the final placement and get the bracket painted.