The flat cars do not say who made them. They are N-scale and are 6 7/8 inches long. I use nuckel couplers. From the truck mounting hole to the end of the flat car is 3/4 inches. Thanks!

I have some long flat bed cars and i need to put trucks on them but my regular trucks will fit but the couplers are not long enought. Where can i get ones that will work ? Thanks!