another option to get these things cheaper is to visit Andre, he probably has them used
according to your profile you live somewhere near Wiesbaden, his shop is
ANDRE' HÖTZEL
Wiesbadener Str. 89 - 91
55252 Mainz - Kastel
Tel. : 06134 / 291912
Andre also speaks English, no problem. Just visit him and he can find out the parts you need.