First, welcome to CHR - glad to have you here!
Google is your friend for about anything out there today. Here's one source for roadster quarter panels that you might be able to make work, and just about any other patch panel you might need - http://www.brattons.com/prodtype.asp...earchCriteria=
Howell is another place you might look - Howell's Sheetmetal Co. - Model A Ford & Model T Ford Parts