not sure why the sn beginning with 19 vs 11 bothers you.. 11xxx was the beginning number for 58.. yours is a mid early 58.
use a utf meeting M2C134 spec for teh hyds. ok to use it in the trans and diffy as well.. otherwise use an 80w90 in the diffy and trans.
I reccomend utf in all 3 if you have a leaky seal between the diffy and hyds where the pto shaft passes thru.
i like a 15w40 for the engine
gap points and plugs to .025