Thank you for the suggestions. With all the older rv's out there, I really thought finding this camera - new or used - would be easier!
The salvage yards either said they didn't have one or would get back to me (and didn't). I called a couple back but struck out. I'm thinking I would have better luck going to one in person with the old camera in hand.
The nearest camera repair is about 50 miles away in downtown Chicago. The guy I talked to said camera repair nowadays is mostly for high end professional cameras. Unless they're one of the most popular consumer cameras, replacement parts aren't available and the cost is prohibitive.
No results on ebay or amazon.
Tim at RV Cams was very helpful. As suspected, my black and white camera is no longer made but Voyager VVCYL37 is a direct replacement. Although a color camera, I will not notice a difference in my black and white monitor. The downside is that it's $227 before tax and shipping.
So unless I find something before spring, I'll probably buy a new color camera. It's still cheaper than replacing the whole system.
Thanks again for all the suggestions.
2007 Winnebago Sightseer 35J
2003 Ford Sport Trac