Does anyone know where I can find online a chart showing what inner tube to use with my tires.

The tires are MT90B16 front and back.
My stock valve stems are chrome and I can't see any on the few sites I've visited that are chrome . Also confused on the side stem vs center. Pretty sure is side. but mine ccomes out and has a 90 degree bend and the ones I'm seeing online are straight.
Thank you in advance....sb