An 18-tooth spur gear (12 DP / 14.5 PA) compatible with Lippert (LCI) through-frame slide-out systems. This is a heavy-duty metal gear used to repair jamming or worn components in motorhome sliding cabins.

A parallel stop (also called a longitudinal attachment) for table saws, specifically compatible with the Makita 2704/2704X models. Other Specialized Items

The part number most commonly refers to several distinct items depending on the manufacturer or brand. Here are the most likely "pieces" you are looking for: Common Hardware & Parts