I believe it is NOS or close to it. It looks new inside and no welding has been done on the axle tubes. I have had it in my QC collection for quite some time. At age 84 I don't think I will be needing it. I have 4 car projects to finish now. All 4 have QC's. The 31 spline axles are drilled 4 hole x 4 1/2" bolt pattern. Maybe you can have them plugged and redrilled to the bolt pattern of your choice. 57 " width. I have replaced the plain cover with a Halibrand finned cover. Really looks good with the gusseted side bells. $4,500.00. *** SHIPPING $150.00***. PS; The side bells and finned cover are no longer in production. 201 or 301 trades considered. H852A side plates wanted.