[Stef]

The Ebay flip key WORKS.
It will take some skills, you will have to move the transponder out of the original box. The transponder MUST BE WIRED to his original pads. it does NOT work without connection.

So:
1- cut the flip key plastic like in the picture to make the original box perfect fit
2- Check the original transponder position (polarity)
3- Remove the transponder from the original PCB (Use 2 soldering irons, to heat each side, or use a special desoldering tool)
4- Connect 2 small wires to the original transponder pads
5- Solder the wires to the transponder (mind original polarity)
6- Glue the transponder in place as far to the front as possible (cut the flip key transponder cavity )

Hint: put some silicone grease on the flip mechanism.
Pollish the metal key part after cutting.
Good luck