I noted that the MAFCA "combined index" (you referenced it above) USED to have a space you could search under your desired term. Now, you have to use the "seen on this page" which is part of most web browsers. And it don't work so well.
I also see Tom Sieffert has changed it, possibly within the last day. There is a search but it's "different."
Instead the link below works better and has it's own "page turner" (you'll see it try to flip its own page) and a magnifying glass for "search." This one works better. Restorer only and Rick Black.
https://mafca.com/model-a-index/
Joe K