Обращаюсь к тем кто в СПб и у кого есть Thinkpad t520?
Судя по спискам совместимости:

LENOVO Thinkpad T520 Keyboard Fit Laptop Model.

Thinkpad T520
 Thinkpad T520i
 Thinkpad T420S
 Thinkpad T420
 Thinkpad T420i
 Thinkpad T400S
 Thinkpad T410S
 Thinkpad T410
 Thinkpad T410I
 Thinkpad T510
 Thinkpad W510
 Thinkpad X220T
 Thinkpad X220s
 Thinkpad X220i
 Thinkpad X220


LENOVO ThinkPad T530 Keyboard Fit Laptop Model.

ThinkPad T430
 ThinkPad T430S
 ThinkPad T430I
 ThinkPad X230
 ThinkPad X230T
 ThinkPad X230I
 ThinkPad T530
 ThinkPad W530


Они не совместимы.
Судя по спискам совместимости:

LENOVO Thinkpad T520 Keyboard Fit Laptop Model.

Thinkpad T520
 Thinkpad T520i
 Thinkpad T420S
 Thinkpad T420
 Thinkpad T420i
 Thinkpad T400S
 Thinkpad T410S
 Thinkpad T410
 Thinkpad T410I
 Thinkpad T510
 Thinkpad W510
 Thinkpad X220T
 Thinkpad X220s
 Thinkpad X220i
 Thinkpad X220


LENOVO ThinkPad T530 Keyboard Fit Laptop Model.

ThinkPad T430
 ThinkPad T430S
 ThinkPad T430I
 ThinkPad X230
 ThinkPad X230T
 ThinkPad X230I
 ThinkPad T530
 ThinkPad W530


Они не совместимы.