DualComm--nice light, too. Looks like the light cans are solid (no vent holes) which would make it an early version. The endcaps on the Yankee/Dietz/NAPA are more vertical (thus making them seem larger) whereas the DualComm cut in on the frame about 45 degrees. While nearly identical in appearance, there is virtually nothing interchangeable between the DualComm and Y/D/N. The light cans can be swapped but not without some tweaking.
Dietz short bar (Created by cutting down a full sized wrecked 911):
I'd go for it if the price is right (and that's what you are willing to pay). The domes look to be in good shape and, absent any dings in the speaker cover, it's a complete and fine specimen!