Fuse wires ? Really ?

  While on a familiarization trip thru my downloaded owner/operator manual for the antique Yanmar YM1500D tractor I just bought (mfd 1975-79) I saw a fuse box ... so I decided to go exploring ! And I found that fuse box , and I popped  the cover off , and I found ... fuse wires on screw terminals ! OK , it ain't exactly state of the art , but it fills the need . I also found tucked in the cover a small plastic package of what I assume to be fuse wires . What I don't know is what the amperage rating of these wires is - I'm hoping one of you might have an idea  . Eventually I will replace this fuse box with a unit that has plug in fuses , but for right now I'm going to clean up the original and see if I can get the lights/horn/turnsigs working .
   I have been bitten by The Tractorbug . And it feels great . I gotta get this one running well so I can do some much-needed and well-deserved repairs/maintenance to Rusty , a 1982 JD 317 . He's been a great little tractor , but he just doesn't have the (m)ass to get the needed traction . This new tractor will be able to drag logs out of the woods that would just laugh at Rusty spinnin' his wheels futilely .
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Snag
We live in a time where intelligent people
are being silenced so that
stupid people won't be offended.