Boy, does this thread seem odd today. I'm very sorry again! I can't help but imagine too, that, only due to my own fault, what some might imagine was said, was much worse than what was actually said - perhaps the attitude behind it was the worse part of it all.
Steve, just to clarify, the intent of this thread wasn't about the T.O., but about trying to reinforce credibility, where it seemed, at least to me, it was trying to be taken away. If there is a slip of the tongue, and something is stated simply because of a lack of knowledge or simply a small bit of memory failure at the moment, that's no problem, but if it is being said in order to add credibility to one's work, and at the same time tries to take credibility away from another's work, that is what I took issue with.
When I stated that nearly 800 P-51D-5-NA's were produced without dorsal fin fillets, that comes from the research I did, and clarified with a number of other well respected Mustang historians/researchers, and not some figure just written in a book somewhere. It comes from having researched (albeit briefly) almost every single P-51D-5-NA produced (serial number by serial number, up the list), photographically. If you know where to find the photos, it isn't all that hard to do. The date at which the T.O. was issued, is known, and this is backed up with photos before this date/time showing all P-51D-5-NA's in their stock configuration. Eventually, starting about September/October you begin to see photos of some of these same aircraft, now configured with dorsal fin fillets. The earliest examples you can find with dorsal fin fillets, are a few of the very last examples manufactured, which were being manufactured during the same time the T.O. was issued. This is why you can't say that all P-51D-5-NA's were manufactured without dorsal fin fillets, but that nearly all were. It was important for me to recognize the fact that, especially by the spring of '45, any P-51D-5-NA still in active service had dorsal fin fillets installed, so that I also have produced/made available with the P-51D-5-NA's, a version with the dorsal fin fillet added (which is also not the same dorsal fin fillet as installed on later P-51D's). You can refute everything I say, but please do the research yourself - it's all there.
Although it seems I'm often the only one that is interested in such things, you'll find in earliest Mustang production, like the P-51D-5-NA, that the elevators were of different construction and covered in fabric. The canopy was of a different design than on any later production models (for spares, the company that produced the canopies for the Dallas production line, supplied canopies to the theatre of operations, and thus a number of P-51D-5-NA's would be, eventually, re-canopied with later canopies). You'll also find by looking in my work, that the armor plate on the early models, was mounted several inches lower than that of on later models, just as it really was. The interior is also about 40% different than the last D's produced - with the cockpit evolving the most, between P-51D-5-NA and P-51D-10-NA production, but also continuing to evolve and change with every production block.
This is what they looked like, and operated as, in the thick of combat in the summer of 1944, from D-Day and onwards. Everything else was developed from there, part by part, assembly by assembly, with a numerous amount of production blocks as a result, due to constant changes and developments over the aircraft's production and service life. The equipment they had in them during WWII, wasn't the same they had in them post-WWII (especially post-1948 - ANG and USAF). They never advanced to the stages that you see in many representations, until after WWII had already nearly come to a close, and they were manufactured too late to see action in that form.