The MacBook Pro 2012 can be equipped with larger SSDs and batteries
MacBook Air (11-inch, Mid 2012) のSSDをM.2接続のSSDに換装した - blog.gorugle.org
How to install an SSD on a 15-inch Retina MacBook Pro
Price history & Review on NEW for Macbook Pro Retina 13" A1425 15" A1398 Blade SSD Solid State Drive 128GB 256GB 512GB 1TB 2TB Late/Mid 2012 Early 2013 | AliExpress Seller -
The next-gen MacBook Pro with Retina Display: SSD Analysis