With a touring bike, personally I would stay with OEM stock compression pistons, more compression more heat and harder on the lower end. HD has quality engine parts, other manufactures do also but when you're flywheels were balanced at the factory it was with OEM pistons, if you go aftermarket the weight might be a little more or less? If you're OEM pistons lived 29 years in you're engine, that's not a bad track record.