Thats the glow plug module card, lots of info on it in the FAQ's for cucv. There is a company that makes them brand new now.
If its for the diagnostic stuff, I wouldn't worry about it too much. From what I've heard the equipment to run a diagnostic test on a CUCV really doesn't exist anymore. And if you can find it, its the size of two full-size fridges stuck together and even back in the day wouldn't really tell you any more than the idiot lights did.
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