D - Cup Outer Diameter | 
                                                                        N/A 18.1250 in460.375 mm | 
                                                                                D1 - Flange Outer Diameter | 
                                                                        N/A 18.5 in469.900 mm | 
                                                                                C - Cup Width | 
                                                                        N/A 0.875 in22.225 mm | 
                                                                                C1 - Cup Flange Width | 
                                                                        N/A 0.2500 in6.350 mm |