I've had white oak advised as a replacement, particularly for my oddball Australian Model A with the wood subframe (the original species, Tasmanian Oak, is very, very hard to find in the US). The previous restorer in South Africa replaced pieces with acacia, as I assume it was easy to come by. That said, I haven't gotten to the point where I need to consider what species to use.
Point of my comment is...in my very general search for types of wood, I came across a government program where you can send them a piece of wood and they can identify the species. I've contemplated doing that with a piece of original wood to see what it actually was and what's close to it. Again...haven't gotten that far, but it's good to know the program exists.
https://research.fs.usda.gov/fpl/identification