Wow first time I will disagree with Stick! Brg is mot a brg. After 42 years in the power transmission bearing business I think anything that has speed or load needs precision. Chinese manuf. is the lowest grade right now but getting better. SKF, FAG, are from Europ. NTN, NSK are from Japan. Fafnir which are now Timken are USA. Most brgs are metric but inch diameter though less common are available. Suppliers such as AIT ( Applied Industrial Tecknologies), Kaman and Motion Industries are the big boys in the States and will be able to help you. Possibly even on line. There are some brgs with inch inside diameter and metric outside diameter and width. Make sure yo measure. Bearings are available with seals and shields amd are prelubed. Do. ot try to lubricate your self as the most common problem with brgs is over lub rearing to much heat. Sounds crazy but true.
Sorry for the long answer.