Ok, here`s my solution.
My mate can help me with his company`s post service.
That would say this:

If you can put each seat in one packet so that the length and girth combined (the longest side + 2x breadth + 2x deepness) is under or exactly 3 meters, it would be free of charge for me..

The two packets will be picked up directly at your home. The only thing you have to do is to get the two packets rectangular so the postman of DPD (german parcel service) can stack them.

If they are not stackable ore over the length and girth combined it would cost me 200 € and in this case i can`t take them..

Plese tell me, if this will be ok for you in this way.

Cheers Nick