What they said, Unless you meant replace them with regular wire the same size.
Fuse links are just regular wire that is a couple of sizes smaller than the rest of the wire so that it melts and opens first before the rest of the harness.
The only difference between fuse links and regular wire that size, is that fuse links generally have a higher temp rated insulation that is flame retardant.
I have seen people replace them with the same size wire with regular insulation, with good results. Personally, I would want the flame retardant insulation.
Either way, Do Not use larger size wire. Unless your life is just so boring that the thought of a wiring fire turns you on......