I have a question about the ninth generation (1992-97) Ford F-250 Heavy Duty series. So far I have found two Ford F-250 Heavy Duty in my roster that contains 1997 model year. I am wondering if the Heavy Duty sub-series were introduced in 1997 model year after the F-150 were replaced with the next generation series

Were there such as 1992-96 Ford F-250 Heavy Duty exists out there? Thanks.