Tire size for 83 1100 Ltd

Hi,

I need to get new tires for my 83 KZ1100 Ltd. The front tire size is 3.50-19 4PR according to the owner's manual. Is this the only type of tire I can put on? The choice seems a bit limited for this size. Can I get something like 90/90-19 or 100/90-19, which seem to be more widely available and cheaper. For the rear, I'm thinking about staying with the original size (130/90-16) unless I hear compelling reaons to use a different size from people.

Also, does anyone have recommendations for good but affordable tires (and stores) for normal city riding?

Thanks!

100/90 19 is the general size. The rear would be 130/90 16

Thanks kzwolfsr.