Yeah, I'm really trying to avoid going back to TT (vibe and weight). I'm getting a bit ahead of the game here as I need to measure out how the frame relationship to the tail is on the T550 and then mimicing an average 700 size heli from there.
Some more research is showing the Logos being some 6mm and 6.2mm wide thereabouts...wider than the Trex apparently.
Some promising catalog listings from this place:
XL in .1875 (4.76mm) widths available. Even in steel-belted urethane! Need to get a mockup of the T550 going to pick a size and give them a call for a quote on a belt for it...