Help with Fusing Question

[Astyl 10+ year member]

Alright Guys, so my amp has no internal / external fusing so i need to put a fuse inline with the power wire, the problem is im a ghetto sonofa***** and dont feel like buying a second fuse holder, my wiring kit comes with the usual 300A fuse that goes up by the battery, can i just swap this fuse out for one of the appropriate current for my amp, or do i have to get a second fuse holder for the amp?

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