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Stellite seats come in all sorts of diameters and thickness can be adjusted if needed. I've seen the original seats crumbling to pieces when disassembling the engines. I'm not sure if Ford used any in the model A era unless it was for repair of worn pockets. I think Ford started using them around 1935 for the V8 engines. They have long been used for repair purposes.
Seat inserts coming loose is not real common but it does happen. They have to be a tight fit with good quality tooling for the counterbore process to get them right.