AntiqueGunParts.com is the best resource for hard-to-find components for antique firearms.
This site provides a calibrated image feature which allows users to receive exact life size images of the gun parts that are calibrated to the users' computer screen or printer. This feature allows matching handmade antique gun parts and ensuring a greater chance of them fitting before purchasing.
This site is in beta test. At this point, only test data is available, and some features may not be fully functional. Do not attempt to order parts at this time. However, your comments are welcome.