Taillight bulb socket replacement as most are corroded

If it's just corrosion and it has not eaten through the sockets, I'd disconnect the starting battery and try to grind corrosion away with a Dremel tool and drum sander and maybe a grinding stone used gently to clean brass contacts. Reconnect the battery and install fresh bulbs. Might need to squeeze socket a little to make good contact with the bulb bases.Worth a try!!