Aloha Skip,
Inner tubes also have sizes. I think the that you can use either a size FR15 or a KR14/15 (for both 14 or 15 inch wheels). Additionally, valve stems also have sizes. Older wheels (50's and earlier vintage) usually have 5/8" stem holes and the corresponding valve stem size is TR15. Newer wheels have a 7/16" stem hole and a size TR13 valve stem fits. If you have a tube with a valve stem smaller than the stem hole in the wheel, a valve stem grommet can be added over the valve stem to get a proper fit.
I suspect that the 155/165 X 15 tube is the one you need, but I would ask Moss for more information to make sure.