Thanks for being honest. I'll do as you suggest and buy them locally. It really is best to feel and see the quality when purchasing your toilet seat. We don't recommend most foreign toilet seats except for a few manufacturers in Europe such as Pressalit . If you drop the lid cover a lot the paint will wear off.
Plastic seats come in many grades and thicknesses.
Also, some toilets haven't been made in MANY years. For example the Case model 1000 was produced starting in 1950 and the model 1100 was started in October of 1952 and they haven't been made in many many years. The seats listed will fit these models. Please be sure that you measure your seat and go with the dimensions listed. Model 1000 for example is round front and model 1100 is for their elongated toilets.