For your 13-inch model and build year series, the unit may
perform adequately with 65W; but not 45W as that's way
below what the MB/Pro would require. ~ For MagSafe2.
45W: is for MacBook Air (11"?) 13" only.
65W ~ 85W for 13- 15- 17" display models.
If you hope to also charge some other
item from a MacBook Pro, while it's also
on a charger, you'd want larger output.
These automatically regulate to Mac's demand.
Their output may be listed as higher; while not
endangering the lower listed MacBook input.
Resellers inventories may include official
60W MagSafe2 Apple power adapters..
OWC has 'Official Apple' MagSafe2 power adapters
https://eshop.macsales.com/search/?q=magsafe2
Several companies have offer retail sales in other
countries; OWC digital and OWC are worldwide.
Good luck & happy trails! ☺︎