here's a great pic at an angle though
SD90MAC Radiator Fans | The Atlas Rescue Forum (proboards.com)
and a brass model
omi sd80mac fans - Bing images
I made my own casting a year ago and the bubbles wrecked it!
BTW I believe the 3 cooling fans will be just under 1 3/4" at the widest part of the round base. Maybe like 1.7"?
I believe they are 48" (O.A. of the fan shell) fans but there's several posts claiming they are 52" fans. 48" would be 1.5" overall on the outer fan shell.
The dynamic brake fan is about the same overall. I'll have to post all the dimensions I believe to possibly help get these made.