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Better auto parts stores do have them, Zone does. In the help/wire section. The bozo's behind the counter can't help you, you need to find it on your own..lol.. For the alternator, get at least 10 ga, if not available, double up some 12 ga....G/L
That I don't know, only my experience with C-4 alternators are over 100 amps, and the fuse link wire is about 10 gauge. The link is not rated in amps, only wire gauge.
A "real" auto parts store can help. Pretty sure the widely-sold "Standard Ignition" product line lists fusible link ... probably in Standard's "wire & cable" catalog.