Thanks to all that replied. This morning, I called the Newmar Parts Dept. as suggested by Route 66 and was amazed that not only did they have them (which I expected) but they had the entire fixture and lens for only $11.45 (which I did not expect).
Needless to say, I posted this question anticipating that the price would be extremely high and more than happy to find that it was less than 50% of the samples found on Ebay. Wow, pleasantly surprised.
Thanks again and I guess I learned a lesson, call Newmar first.
Jim