Recording this info in the event it helps anyone down the line.
Summary:
Glow Plugs: 19077-65512, 19077-65511, 19077-65510, 1J860-65510, 1J860-65510, 1J860-65511, 1J860-65512 are all linked as similar using Kubota's Illustrated Parts and Messick's.
GP price is different depending on PN...