I got recently got dual MAXI holders from some French car (Pug maybe?) complete with one 40A MAXI fuse.
(Though for 40A - why bother? I'd be tempted to use the plastic flinks (fuselinks) for up to about 100A (their max rating?) since there are lots of modular boxes for them (from cars). But for ~40A & higher, I'd be tempted to use the bolt in types - but that is based on one hot discolored 40A plug-in flink in my engine bay - ie, bad contacts -> heat -> melts but doesn't blow. Different for clean stuff not in e-bays.)
That's more FYI FWIW....
BTW - I tend to use circuit breakers; ~AUD$7 each for blade types (to 30A) for lights & other "critical" accessories , and up to 50A stud & bolt (weather/water-proof) for (eg) my inter-battery connection (to supply a load of 2.5A max but cable capable of 100A or more). They are self-resetting so headlights come back on, and flat aux batteries that have taken a charge above 50A eventually return to normal service (rather than finding at the end of the trip my fridge is not cold, and seeing the tree before the headlights drop out again).