Yes I am using the "pimp my ride mod" However, THIS is my skin and took me a long time to do it. His MOD had nothing to do with me figuring out the placing of the numbers and the numbers are on majority of the submarine pics out on the internet. So your statement above is not fully acurate! Thanks.
From the posts I have found on the forum, most modders did not include them because the numbers would appear on the towers in reverse. The only numbers they could use were 181 or 111. That is why I figured, I would take the time to figure it out cause I liked the idea.