Custom node icon for a link forum

How would I put a custom node icon on a link forum?

.node.node_272 .forumNodeInfo .nodeIcon, .node.node_272 .categoryForumNodeInfo .nodeIcon {
    background-image: url("images/nodes/news-r.png");
    background-position: 0px 0px;
.node.node_272 .forumNodeInfo.unread .nodeIcon, .node.node_272 .categoryForumNodeInfo.unread .nodeIcon {
    background-image: url("images/nodes/news.png");
    background-position: 0px 0px;

Where the node_272 is your actual node #.
This is for an actual node forum (my news forum so I have a read/unread indicator).
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