Those beam fittings look like shaped delrin bolted to the beam. Could be easy to make with a lathe. Otherwise, just use the tried & tested method of riveting eyestraps to those same locations...worked great on older Tboats. Current T's use the same stainless hooks (found along the inner gunwales) on the rear beam. Two things that are different on the Marstrom T...the tramp laces to the front of the rear beam (I think this is an option on the Marstrom Tornado order form) and the hooks are not in a straight line...they get higher off the water towards the centerline of the beam...I suppose it helps raise the tramp up a bit...but the beam is still there to smack a wave!