Hans,
You will note that the injectors and distribution blocks and pump are supposed to be all matched. The distribution block outlets are stamped A,B and C and when I removed my injectors I noted that they too had been stamped with these letters. In some cases more than once indicating they had been refurbished.
If you send all these components as a complete set then you know that what you get back will be 100% correct.
The interesting aspect for me is what will they do if any of your injectors are unserviceable. I have not found anybody so far who can refurbish these old style injectors although historically it was possible. By refurbish I mean rebuild, not just stick them in an ultrasonic bath and hope they work.
Please keep us updated if you have info on this.
Regards
Peter