You might try the Old Bike Barn (google it, this site doesn´t like URLs I guess, I´ve typed this message four times now). They have a variety of sprockets listed for the CM400T, which is the ´cruiser´ version of the CB400T. Fronts from 16-18T and rears from 34-37T. All are 530.
They also sell a 530 o-ring chain, but I advise against it- the clearance under the trans cover is pretty tight, and the wider stance of the 530 o-ring may gouge the side of the case. If you want to go with o-ring chain, drop back to 520 sprockets and chain, that´ll give you sufficient clearance.