Caterpillar Needle Roller Bearing 5M0578 Truck Loader M915 Scraper Grader 167Y. 13H612 is a roller bearing made by Shefford Meade inc cage 9U578. This is also covered under Caterpillar part number 5M0578 or 5M578 also covered for military applications under NSN 3110-01-079-7030' fits the M915 truck along with many other CAT applications. The inner diameter is around 1.688 x 2.02 OD x 0.988 wide this is a solid powdered metal cage. Check out my other stores on Ebay, one of the largest inventories of "Creatology" and "Celebrate It" products from Michaels Stores more 1950's "pinup/model" pictures and Negatives. Bonanza has both my ebay stores combined into my Bonanza Booth, "DiscountCrafts4U", except the items I have listed in the "other" category on ebay that are not listed on Bonanza. Remember you can make an offer on any of my items on Bonanza by adding the item to your cart and then open the cart and click on the "make an offer" link. Be sure to check out all the freebies I have listed here on Bonanza too. My other 3 stores are: You will haft to copy paste into your browser links below http://stores.ebay.com/Stargate-Cool-Stuff?_rdc=1 http://stores.ebay.com/Debbie-Dabbles?_rdc=1 You will not find better deals for the price anywhere. I combine ship on both stores to save you money. I have great feedback - fast ship - lots of other great stuff to check out.