Which AC adapter for Asus RT-N18U

Can somebody please post photos of Asus RT-N18U AC adapter? I do not have original so I need to properly set universal AC adapter. And I cannot find it anywhere on the net. Thank you

According to https://wikidevi.wi-cat.ru/ASUS_RT-N18U:

12 VDC, 1.5 A, barrel connector, center positive

Thanks, I have two universal barrels which will fit (larger and smaller - currently I am not at home but I guess largesr has G letter on it), which one to use?