Just get a plain white at any autoparts store, Walmart, etc.
Even if there are several whites, pick out what you think is closest.
You can use Enamel or Lacquer. Be sure to use a Primer though.
Cost around $3.68 for the paint and $4-5 for a good filler primer.
If you ride as hard and much as I do, small mismatches are
not noticible to the general public.