I hate it when that happens, so I recently downloaded a "new" book for my "old" (1970) M37, from GunShowOnTheNet.com.
The blue text on black background is kind of a pain, but the list is alphabetical. This link will get you right to the PDF (Adobe Acrobat) for the Ithaca 37/87 "Field Maintenance Instructions."
Sometimes even with instructions, I end up with parts left over.
"Read The Fine Manual."
Thank you very much, this was just the sort of thing I have been looking for, without any notable success.
-Cheers