Two-stud vertical rolling bearing seat help questions

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The rolling bearing seat is a standard part and has corresponding applicable bearing models. The standard is attached as GB/T 7813-2018. The outline dimensions of the split vertical bearing seat of rolling bearings. There are the following questions about the bearing seat. 1. Some bearings do not belong to the supporting bearings of the standard bearing seat. Can the standard parts bearing seat be used? Is it necessary to carry out non-standard design? Are there any design reference specifications and information about non-standard bearing seats? If so, please share them (on what basis are the non-standard design parameters of bearing seats determined? How to choose studs for two-stud vertical rolling bearing seats? Are ordinary studs sufficient?) 2. The attached picture shows the matching structure of the bearing seat and the shaft. This standard bearing seat and end cover are integrated and not fixed by bolts. The outer diameter of the bearing is larger than the end cover hole. How to install the bearing? The black in the red circle in the picture should be the locating ring for axial fixation. How is the locating ring installed (cannot understand from the picture). Is there only a locating ring under the bearing in the picture? It is just a simplified representation. It should be both up and down or not at all. 3. Is the standard part design step to select the bearing first, then select the bearing seat according to the bearing outer diameter, and then design the shaft diameter? ； When designing a non-standard bearing, the bearing seat is designed based on the outer diameter of the standard bearing. Can the rest of the dimensions of the bearing seat be referred to or directly use the dimensions of the standard bearing seat? (Same as the first question, how to determine the design parameters of the non-standard bearing seat?) Due to my lack of design experience, the questions I asked are a bit awkward, but I am really confused by the above questions. I kindly ask the forum brothers to give me some advice. Thank you very much!