Dave Butler at Coleman Marine - (619) 223-8824. Dave is most knowledgeable guy I have found.
If you are on a budget, get parts manual so you can get part numbers direct and go to local cummins dealer. I have local truck repair place that I've gotten allot of parts from this way. Don't let them know it's marine application if you can help it, I'm pretty sure they have a big flashing notice on their parts screen that says 'Rape 'Em' when they designate part for marine engine. Thank the US Coastguard for that.