Alvin, I know exactly what you are talking about. I went through the same initial stages as you on my 1952 and drilled mine just as you did yours. Looked pretty good but I hadn't even started final sanding yet. I also did not attach the mirror to check. Didn't seem any point with no seat. I did a lot of online searching before I drilled my holes and I am sure we have them in the right place. I suspect this is going to be another case just like the front emblems. Looked good on a quick mockup but when it gets to the fine fit these are issues. I have not tried fitting mine since I painted the cab. I can't mount the cab until I get the darn stainless steel brake lines to stop leaking.

Chuck