trim - Colonial style casing / backband and alternatives - Woodworking Stack Exchange

Here's my issue, I have windows and door casing that appears to be 1x6 that was custom routed, my down stairs is almost identical but has a backband. My current baseboard trim I've come to find has

trim - Colonial style casing / backband and alternatives - Woodworking Stack Exchange

trim - Colonial style casing / backband and alternatives - Woodworking Stack Exchange

trim - Colonial style casing / backband and alternatives - Woodworking Stack Exchange