I can't help you i=on wheel size, but remember the disc must fir the smaller diameter.
If you are dedicating wheels to rain tires, and can find Hoosier Dirt Stockers, that's a great choice. Butm they no longer make them.
The current Hoosier rain offering it the rain radial, also known ans the "molded rain".
barring those, jeez, among street tires, I don't know. I might hit Tire Racks web site and dig some info up there.
And, there's always full tread Toyo RA-1s. Full treads are ok in the rain, and shaved they are OK in the dry.
See you there. What run group are you?