I have Autocom and an RF1000. Not sure how the helmet speakers compare size-wise with the Starcom speakers, but I suspect they are pretty close. In my case the only way to get them to fit properly would have been to do a little bit of trimming of the ear cavity area inside the helmet with a Dremel tool. This would obviously void any warranty or whatever, although I doubt whether removing a few millimeters of foam would seriously compromise the safety of the helmet.
That being said, I chose NOT to carve up the helmet and instead wear a set of Klipsh x-11 low profile noise-isolating ear speakers hooked into the Autocom rather than the helmet speakers. I just cut the speakers off the headset loom and taped up the end of the wire. This works well - better audio, good noise attenuation, very comfortable for 12+ hrs of riding in a day, and I didn't have to do surgery on the helmet.
YMMV, and all the usual caveats.
Griff