D - Cup Outer Diameter | 
                                                                        N/A 20.0000 in508.000 mm | 
                                                                                D1 - Flange Outer Diameter | 
                                                                        N/A 20.4336 in519.013 mm | 
                                                                                C - Cup Width | 
                                                                        N/A 1.875 in47.625 mm | 
                                                                                C1 - Cup Flange Width | 
                                                                        N/A 0.4375 in11.113 mm |