First, I always encourage anyone who'll be owning and/or working on these old Galaxies for any period of time to get a copy of the Ford Master Parts Catalog. It has just about everything you could ever need. You can get a copy on Ebay for $25 plus shipping. Here is an example and according to the listing, they ship internationally. I have no affiliation with this seller or anyone else related to the Ford MPCs sold on Ebay or elsewhere. Instead, just speaking from invaluable experience.
Beyond that, one of the first things you need to do is identify your fuses more precisely. They are listed in your Ford manual. If you don't have one, you should also be able to find one on Ebay. They're handy and cool to have for old-time's sake, but not necessary. I posted a picture of mine which shows the fuse page just so you can see what it looks like.
Second, if you had the Ford MPC, you could refer to both the Fuse and Application charts which are handy to have as references. That way, not only you can look up the exact measurements and part numbers, but the industry cross-reference number. I posted a picture of the Fuse chart for you and will add the Application chart in the next post.
Basically what you want to do is starting by looking up the fuses for your car in the Application chart. That way, you have the correct Ford part number for your fuses. On the right columns, you'll see both the Industry part number and Ford part number. To be sure, you can confirm the fuse with the measurements in the Fuse chart.
Once confirmed, you can search for glass fuses using the Industry part numbers which are shared across many makes, models and years. Example: C0LY-14526-B (Ford part number) = AGW-4 (Industry part number). Now you can do a search on Ebay/Amazon/Google for "AGW-4" ... rather than C0LY-14526-B ... or 4A fuse ... etc.
I'll post the Application chart next.