6DH20 is not a Husky 500 needle (7DH3). It is however used in some CR/WR125's & CR/XC250's. I don't have the specs but last time I checked one against the common Husky 6DH3 needle, it was longer by an obvious amount. I used one in a CR430 which would normally use a 6DH3 & it seemed to clean up the bottom & mid.
Cheers,
K