99 Drifter 1500, need a tube for 195/55/16

Im going to be running a 195/55/16 on the back of my drifter.

I tried sealing the wheel, emphasis on tried. I prepped the hell out of it, wire brush by hand then brush wheel, cleaned with pure acetone, used 3m 5200 fast cure between temps of 50-75 deg with high himidity, i put around each spoke and pressed in and i made a perfect trowel to apply in the channel and let it set up 7 days.

Well today i go to put air in it and its leaking from almost 1/2 the spokes, so i pulll the tire back off the wheel and i was able to pull the entire thing out by hand in one piece. it was full of air pockets/channels and i feel ashamed for what i did.

Well regardless im going to just run a tube now instead of trying it again, so could someone please tell me what size tube and reccomend the strongest/best one to buy.

would a 200/60-16 tube work? and if so does anyknow know where i can find one with a 85 deg stem?