Here you go!
IPR Injection Pressure Regulator
(Ford) F4TZ-9C968-C (engine serial no. 187099 & before or pump no. 255C92)
Part number F4TZ9C968C was superceded by part number 2C3Z9C968BA
(Ford) F81Z-9C968-AA (engine serial no. 187100 & up or pump no. 247C91)
(International) 1824982C91 (engine serial no. 187099 & before or pump no. 255C92)
(International) 1833798C91 (All Years ???) latest part number
(Motorcraft) CM-5013