Rain water drain cover replacement

Do you mean an inlet grate? Is it a yard inlet? If, so try a highway construction suppler or salvage yard. Or have a welder or other metal worker make one.

It is on my driveway.

Is your drive concrete and was the old grate iron? Try Grainger Industrial Supply http://www.grainger.com/Grainger/wwg/start.shtml?gclid=CLOH4fGhircCFSJlMgodxGsAlg&cm_mmc=PPC:%20Google%20Main%201-_-Brand>Brand-_-Grainger>Industrial%20Supplies>Exact-_-Grainger%20industrial%20supply&ef_id=UV1PGvG4oGgAAIFh:20130510001919:s

http://www.grainger.com/Grainger/ZURN-Full-Floor-Drain-Grate-22F398?Pid=search