Schaff Piano Supply is in Illinois.  I don't know of one in Michigan.
USA phone number is 847-438-4556.  Their fax number is 847-438-4615.

They have a new catalog out which you can obtain with an order.  All
the American action parts are made by Baldwin.  They also have but
listed in catalog some parts made in Japan.  Ask for the parts from
Japan if you want better leather on your hammer butts, etc.  The parts
from Japan are also straight and therefore need less adjusting once
you install them.

Don Teach
dat-smc@juno.com