Pint,
The triangle reflectors are rare and usaully demand a premium price. the side reflectors are regular 3" reflective tape. I bought mine from Galls and it was pretty inexspensive. The safety chains can be replaced by m416 chains which are faily plentiful and cheap. Army Surplus Warehouse has a good deal on them (link below) If you really need the originals I have a friend which is working on buying an entire front casting section just to get the lunette and associated hardware. He was planning selling the remaining parts (chains,landing leg, and V casting) I am sure he would work something out with you. Hope I have helped
1/4 ton Jeep Trailer Safety chains - Army Surplus Warehouse - Army Surplus Warehouse