Osborns,
How bad are the cracks? If there are no pieces mssing I would glue or plastic weld them back together, sand with very fine sandpaper and add some filler if you have to then paint it and silver leaf the raised sections. Might cost $25.00 and some time. The only repo part I have ever seen was for aftermarker gauges, which does look like a nice piece. Maybe someone who has one can tell you if it can be modifeid to fit the original factory gauges. I do have another one with a small chip missing around the sterring wheel. if you are interested let me know I could try to repair it, repaint it and do the silver leaf.
Thanks
Pat