Are the backrest bars pretty universal in size? My kids bought me a rollanator and put it together. By the time I got it they had thrown away the box and when I got it I realized there wasn't a backrest bar

We highly recommend purchasing the backrest that is compatible to your rollator as each rollator does not have the same dimensions. You can find our complete list of replacement parts here: https://carex.com/collections/replacement-parts

I need 2 brake cables for our walker where can I order them from

Our right and left hand brake assembly both come with the brake cables.