D - Cup Outer Diameter | 
                                                                        N/A 21.0 in533.400 mm | 
                                                                                D1 - Flange Outer Diameter | 
                                                                        N/A 21.3750 in542.925 mm | 
                                                                                C - Cup Width | 
                                                                        N/A 1.375 in34.925 mm | 
                                                                                C1 - Cup Flange Width | 
                                                                        N/A 0.3750 in9.525 mm |