If the rifle has sling swivels on it you will find the Montana Slings to work well and it looks as classy as the Marlin does. I have them on a pre-64 M70 and a M88, love them.
Another good choice is a heavier, but hell for stout sling made on the old US Army design by Turner Saddlery - here is a partial view of one on my M1895 Marlin.
Here is an old Hunter brand lightweight copy of the US Army design on an old Winchester M70