All the mechanical/propulsion parts on a Luscombe with the exception of the brakes are available in the same way they are for the copy cat two seat Cessnas - because they are mostly the same parts. Airframe parts are available from e.g. Univair and many can be made from sheet metal by a skilled A&P. Unlike the Cessnas not much on a Luscombe was highly ‘tooled up’, pressed etc, for example compare the construction of the doors. The labor saving industrialization of the Cessnas was more advanced, but today this might be considered a disadvantage if you want to make a new component from e.g. sheet metal and welded square tubing like the Luscombe doors.
In addition, they made 6,000 Luscombe 8s and used, serviceable parts are pretty widely available. In the 60s-80s (roughly) Luscombes had very low value and a lot of them got taken apart after an incident… only about a third of those built are still flying. However this means a lot of parts are floating around. There is a fairly active network between Luscombe owners, and parts move around.
A friend of mine has been a serial Luscombe restorer for about 30 years, I have no idea how many he’s ‘built’, maybe six or more. My ex-8A was his first, highly polished, completed in the 90s and best of show at the national Luscombe fly-in one year. A metal winged 8E was later bought for something under $5K and dragged home from where it had sat on the ramp at a desert airport for so long the windshield was brown and opaque, the tires were flat for years and hard as a rock, the instrument panel looked like it had been sand blasted, the engine was frozen and the firewall was literally packed with hardened dirt to where it was hard to distinguish components. It was also made into a show winner. They are quite restorable planes
One hard thing to get on a Luscombe is wing struts for a pre-war fabric covered wing. The post war fabric wing struts are easier to source. None of that affects the all metal wings or their struts that went into production in March of 1946 (there are three different types of wing and struts). It’s amazing how fast things changed while most of the 6,000 Luscombes were built within a four year period. Imagine that today.
Years ago the center of Luscombe enthusiasm in the LA/OC area was Corona Airport. I think those days and people are mostly gone but you might still find a Luscombe or two there, and some remnants of that era there. Maybe somebody else will know.