Used Arctic Cat Snowmobile Toolbox. Part # 0116-587. It is hard to see in the pictures but the rivet holes have very small stress cracks. The color is also faded and the toolbox has some dirty spots and stains inside. The pictures are a good indication of condition.  

Fits the following models:

1977 EL TIGRE 4000 - TOOLBOX AND REAR BUMPER
1977 EL TIGRE 5000 - TOOLBOX AND REAR BUMPER
1976 EL TIGRE 440 - TOOLBOX AND REAR BUMPER
1976 EL TIGRE 500 - TOOLBOX AND REAR BUMPER
1975 EL TIGRE 340 - TOOLBOX AND REAR BUMPER
1975 EL TIGRE 440 - TOOLBOX AND REAR BUMPER
1975 JAG 340 - SHROUD, TAILLIGHT ASSEMBLY AND REAR BUMPER
1974 EL TIGRE 295 - TUNNEL, TOOLBOX AND REAR BUMPER
1974 EL TIGRE 340 - TUNNEL, TOOLBOX AND REAR BUMPER
1974 EL TIGRE 400 - TUNNEL, TOOLBOX AND REAR BUMPER
1974 EL TIGRE 440 - TUNNEL, TOOLBOX AND REAR BUMPER
1973 ElTigre - TUNNEL, TOOL BOX, & REAR BUMPER