Need advice on installing a tv

A friend of mine needs help installing her tv. She had a wall mount that extends out, it supposedly came with "universal size bolts." She bought a LG UHD TV (55UN69) and wants to install it on her wall mount, does she need to buy new bolts? And the TV should have screw holes to install the wall mount, correct? Thank you for any advice in advance. via /r/tech https://ift.tt/2EvsWOR