If you need an IPB Baker makes one that is sealed and a slip fit. I believe it's marketed as a Hi-Torque bearing. The race that goes on the shaft is not pressed on so it's less likely to become misaligned. As far as tensioner go get rid of the factory one and replace it with one that is manually adjusted. Leave "3/4 play in the chain when it's cold and all your bearings will be happy.

 

The "Glittery" could be your starter drive and ring gear wear depending on the glitter color. I say ride it another season. Your chain tensioner while worn, is not that bad. If I had a dollar for all the bad **** guys told me that didn't actually come true... ****

 

After replacing all the bearings is the transmission quieter now?

 

Look at the year of the last post.
Last time OP was here was 2018, same month he joined.