1981 KZ305 130/90/16 & 3.25x18 fit?

I am going to order tires today and factory (120/90/16) (90/90/18) 16" tires are not the easiest to find, I should say not a lot of choices!

I drive on a lot of gravel roads and want to build more of a Tracker style bike. The only size tracker style tires I can find are 130/90/16 and I would like to go wider anyways. Has anyone tried this size on the rear? I am worried about it clearing the swing arm, looks like enough room just not sure?
Also want to go a little bigger up front, I am thinking 3.25/18? Will I have clearance issues with the front fender bracket, has anyone tried this size?
I will be going to the shop around noon, so hopefully someone can get back to me soon. Thanks in advance!!

Sticking a wide tire on a skinny rim is a big mistake because the profile of the tire will be distorted. Ed