Dave........understand yer problem with them skinny 19" tires. Yeah, you can change the 5-bolt WIDE hub of the 2N to the 6-bolt NARROW hub of the 8N. Bitta PIA.
More better you consider DIFFERENT 19" tires. Think dirt track motorcycle tires ...or... space-saver spare tires. You'll still haffta use inner-tubes. Tubeless tires won't seal on tractor rims. ........Dell