Rich Pern at camaros.net gave the suggestion of low light and take digital with flash so I tried that and it did work. I also have what appears to be a larger B or maybe even a larger 3 to the left of the x3 marking. any idea what this is or am I just seeing things. will try to post a couple of these pics so you may be able to see what I am talking about.
Congrats Bill, just passing on what others taught me. One LM1 car I had, had a X1 Grn on the back bulkhead. It was a green interior car. Seems like the interior color, or first few letters was commonly on the rear bulkhead.