Robodrill pull stud SK30


I’ve got Robodrill which has alternative tool holder SK30 DIN69871. And of course it’s not using either SK30 pull studs or BT30 pull studs but BT30 pull stud with 0.6mm longer shank. So the dimension L1 flange to shoulder is not 0.707″ or 18mm it is 18.6mm. I see all the other dimensions are identical to BT30 Pull Stud. So my question is, is there any other source for these studs other than Fanuc? Anyone dared to try BT30 stud or maybe use 0.6mm shim between holder and stud?