I have a 2003 workhorse P42 with a naturally aspirated 6.5 Chevy diesel. Got a code for a glow plug which is said to be a glow plug control module. Its right inside the dog house, so I can access it. I can’t find the exact model anywhere on the web. There are other model numbers for a 6.6 duramax. Does anybody know where to get “hard to find” parts? Thank you in advance for any & all help.