I looked in my shop manual and it says that the rear axles in the 3/4 ton and the 1 ton trucks are the same, but I can't find anywhere which axle it is. I need a new pinion seal and the autoparts store is asking whether it is a H033, H035, H052, H072, or Spicer 45. I don't which it is. Any help would be appreciated.

1959 Chevy Apache 3600

My rebuild album, including my reference shots:

http://s1130.photobucket.com/albums/m537/kjhibbs99/Apache%20Rebuild/