RE: Ultrsport 60 and Retracts
I'll second the 3dx retracts. I've got them in my US 60, with 3/16" struts and they work great. I haven't been able to locate them on the 3dx website lately and I also thought they might have quit making them. I'll follow the link above and see if I've just not been looking in the right place.
Oly