Jaycar are dirty liars - many times now I have the "these are not made any more" - translated "we don't stock it".

Components going to make room for more USB pole dancers and other important plastic crap.

Just did a quick search for "radial PCB fuse" in Australia and these guys popped up:

https://swecheck.qnetau.com/phpcode/list_products.php?product_group=2&collection=6&series=33

Man they have every type of fuse I can think of. I have no idea if they are happy to deal with retail - consider this more a "point of hope" that they certainly are available.

Cheers
Jacob