I have an Isaac Cromer b. c. 1811, and his wives Sarah Cates(?) and Rebecca Singley. Isaac had four children, Dolly b. c. 1838, Mary Adaline b.c. 1840, Susanna b.c. 1844, and John Findley b 30 June 1845. These may not be yours, but they might be related to yours. There were Cromers in PA for over one hundred years before your dates.
If you get hooked up. wap what I have for your information.