..pravin.bansal..
Hard to say all detailed info source of Apple power adapter availability.
Several official model specs can easily interchange to work correctly.
Identify your Mac power adapter - Apple Support
//support.apple.com/en-us/109509
"If you're not sure which model you have,
learn how to identify your MacBook Pro."
The higher spec adapters of same vintage may have shipped with 15-inch
MacBook Pro, as USB power-delivery was a newer standard; as these are
capable of matching demand of Apple Products; they never force-feed.
So a 61w power supply would naturally be superseded by other stock #s.
Overseas where 'third-party' independent resellers of official Apple parts
& accessories, may also be your primary source; they may do repairs too.
