You can buy those from a good plumbing supply house like Fergeson in the sizes you mention including adapter elbows with different diameter ends. They're usually made by Fernco and colloquially referred to as such.

https://www.supplyhouse.com/Fernco-...2yGByQw75jcJX4cJjzGnT6xgX5RoC6WgQAvD_BwE


1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)