Yep, the Custom Dynamics turn signal LEDs were a bit too big for my front signal housings.
I called tech support because I noticed that I ordered GEN200-A-1157E-T but the package stated they were GEN200-A-1157E. The Tech wasn't 100% sure, but he thought the "-T" indicated a smaller flange. I just dremmeled it down to size rather than send them back.
They are bright, but not as bright as I expected. Possibly because I ordered amber LEDs and I have the OEM amber lens. They would likely be brighter if I used a clear lens.
Regardless, they are brighter than the OEM bulbs.
I also installed the DOT flasher (P/N: EDFR) in place of the OEM flasher. It does not auto cancel, but that's not a big deal to me.
The tail/brake LED on the other hand.... are AWESOME.
VERY bright and noticable.