I just did a kwik flip and compare of a 4076 with a 4067, 4068, 4080 and 4074. The truss rod under frame looks to be the same part. The underframe from a 4X72X reefer that I'm repainting has no number on iteither. The non trussrod underframe on a 4090 boxcar also looks to be interchangeable with the trussrod version.
Hope this helps
Hope this helps
