W213 SE seats

[Linmar66]

I am trying to find out if there is a MB adapter that would allow me to attach a coat hangers to the headrest posts on my W213 SE. The seats “curve” upwards on the rear panel rather than being flat and it seems that it is an impossible task! Just looking to have somewhere to hang my jacket and at a bit of a loss. Thought about the standard cross post adapter and adding a couple of spacers to raise the receiver above the curve in the top of the seat but would prefer it if there was something MB produced!