Where can I get one for a resonabl price and what can I expect to pay. Do I have to replace the whole assembley or can I just replace the lense. Ours was broken by a rock. When I saw the hole, i looked a litle closer at tit and the rock was still in there. At first I thought maybe someone that didn't like diesels had come for a visit while in a parking lot or something. Boy, was I relieved to see it was only a rock. I can handle this. So what's it gonna cost ballpark?