Welcome to the site.
Lots of info and opinions here. To get the most out of the site check out the Knowledge Base and use the search function for quick answers to your questions. As well check out the Project Journals for info and inspiration.
About your parts question - I don't think there is a lot of reproduction parts for that truck. I think you will be looking for used or new old stock parts in your case.
You can check out the International old truck club for info as well:
There is a International Nats in Spingfield, Ohio ( long trip) in August and I think they have a swap meet.
Glad to have you here and enjoy the site.