Projects Looking for replacement gm 3 speed parts

I've got a 63' chevy c20 with a three speed trans. I'm looking for a new first and reverse sliding gear and counter-gear. I have seen a few places to get the counter gear on ebay but no dice for the sliding gear. Does anyone have any ideas on where to find them. There are no scrap yards near me so no dice there. Attached are the numbers on the trans if that helps with the detail.

00EF0BA2-6D08-4879-ABC4-90FCCEAC6A9E by Mark Fuller posted Oct 31, 2021 at 1:46 PM

27CA5E69-C928-4157-B85C-A6DC410BD0F4 by Mark Fuller posted Oct 31, 2021 at 1:46 PM

FE446EB6-9723-45B7-9644-07746BC44D84 by Mark Fuller posted Oct 31, 2021 at 1:46 PM