A few resellers of Apple products offer the MagSafe port adapter so newer charger will fit
some of the older magnetic ports. I've seen them online, when not looking to buy one.
Another source for replacement original equipment MagSafe power supplies for older
MacBook models to check into, may be OWC macsales.com. Check to be sure of a
best match, or talk to someone at such companies before purchase. Helps to be able
to correctly identify the computer so that a knowledgeable reseller can match one up.
Good luck & happy computing! 🙂