i needed a single 42 slow jet for my bike (PO had drilled one for some reason) so i just went to my honda dealer with the correct jet as a sample and had 'em order one. about a week, about $7.50.
(i'd recommend bringing a jet with you as a sample, as it's possible some carb swapping has occured somtime in the last 3 decades). bike bandit has 'em for your bike, but they're listed as 38's.
i love 38's,
bobp