Upgrading Fusible Links to JCase Slow Blow Fuses in Older Vehicle—Wire Size & Amp Rating

Hello everyone,
I am doing work on a older model vehicle that has Fusible Links instead of fuses. I've found little to no information on a way to remove and replace the links with a easier alternative like a blade fuse. But through my research I have compiled some info and I think I have found the answer but before I go ahead I would like to get reassurance from the experts. So here's what I've come up with so far. 
They do make a "Slow Blow" fuse in a Jcase style. They sell the holders in a couple styles but I think the inline will work for my application. I have determined that the wire size for the circuits I want to replace Fusible links in are 12 & 10 awg. The ampacity of those wires are 40 & 50 amps respectively. The Fusible Links are roughly 14 & 16 awg respectively which is about 4 sizes smaller than the circuit wire. So my deduction is that the Fusible links must be rated at about those amps. The wiring diagram shows 3 Fusible links, 2 12awg and 1 10awg. So my plan is to replace those links with the corresponding Jcase Slow Blow fuses. If you read about the Jcase fuses they say they are designed to replace Fusible Links. Here are a couple links to the info and products I plan to use. If anyone sees a flaw in my research or execution please let me know. 
https://www.waytekwire.com/item/46150/Littelfuse-FHJC1002G-Inline-JCASE-Fuse-Holder/

https://www.delcity.net/store/JCase...MI_8f-7eSZ1wIVxVt-Ch3e9giTEAQYASABEgKIUPD_BwE

https://technick.net/guides/electronics/awg_to_metric/

Justin, sounds like you know your stuff reasonably well and are not about to bypass the fuses, which would be a bad idea..... replace them certainly, but ensure you do have suitable protection.
I do radio and other equipment installations in vehicles and we user similar fuse holders  to your first line.  They're pretty reliable and waterproof and we don't get a lot of problems with the,  If you use them make sure you fix them to something so they can't vibrate or shake around.  That HAS given us problems.If the second link fuses will directly replace yours then I reckon that is the way to go, no rewiring needed?  if you buy what you need plus some spares, keep them in the vehicle and you shouldn't get caught short.You can (if you can get at them) rewire your fuses or Jcases with suitable wire, I'd just see if you can get ordinary fuse wire.  Vehicle batteries have a lot of oomph and if you short something, almost any reasonably dimensioned fuse will almost certainly blow.  As you've observed, the fusible links use a much smaller wire than the cables they are protecting.  If you stick to that, that will be the point that burns out if there is a fault.As long as you are careful, any solution will work, good luck with it.  // David