Hi Rob,
If you send me your vin number I can certainly look at getting you a date card, however with it being a fire engine I might not be able to (it may be similar to the military mogs where they're not listed)
Also in regards to running veg, the OM352 although not the best, will run veg oil happily (I'll wait for moose to confirm this).
If you want to go the whole hog take the OM352 out and replace it with the OM312, perfect for veg as it has pre-combustion chambers