New Amp and questions

[jteske88 10+ year member]

Well I picked this up from a member, it was done local. I realized the amp had an issue and started by looking for issues. Right away i notice the leg of a fet was damaged and arcing at a certain voltage. Well amp is working great now, looking new since i buffed the plexi and metal. Just a few pics to show.

I am wondering what kind of fusing i will need for this? I cant seem to find any info anywhere.

and bad fet:

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