Installation Media for Windows 7 on T450s

[Sambo]

Thinking of purchasing a refurbished T450s which comes with Windows 10. Hate Windows 10, and would like to install Windows 7.

Does anyone have a method or source to the Lenovo installation package for this particular model? Would a Lenovo factory Windows 7 hard drive from a T440s be able to recover Windows 7 on a T450s?

I do own legit copy of W7x64, but i know how long it takes to install that plus all the Lenovo drivers and software - looking to save time / energy.

Thanks in advance,
s