'65 Panhead

This same panhead engine (with the flywheels full o' holes) has these sleeved cylinders.  Looks like a good job however. 

The inside of the cases are all gooped up with some type of yellow sealer?  It looks weird, but I guess it's ok too . . .

Check out these lifters.  Kinda neato.  They have sealing rings (like a piston ring) that runs in tappet bore.  Fancy.

You must compress the rings to get them in the tappet block.  I'd never seen these before.  Which aftermarket company made these?