Hi Leonard,
Last year my mechanic asked me to help him in order to find a set of seals for my R11 pump. Since long time you can never find also this parts, what you have asked for.
By this occasion I found Marcel Kappen in Holland- who had all this parts as only one in Europe.
So I was really happy to get the parts from him.
The problem, what I see is the price, what Bosch is asking for. In my opinion the set price is far away from the value of this few rubber seals and plastic parts.
Maybe you could think over the idea- to prepare such sets for the members of this forum? ( a lot of this seals are standard parts, and the other could be produced by 3D or by using template?)
Best wishes
Sebastian