Dose anyone know if hubcaps from a 1959 GMC 15" wheel will fit a 17.5" wheel?

I have 15's on the truck now and would like to put the 17.5's.
It's a 6 lug wheel.

Are the 17.5" 6 lug wheels a split rim?

Dose anyone know where I can find 17.5's and the tire's for them?

Anyone out there have 17.5's on there truck and if so,what is the total height of the wheel?

Thank you,
Bob