Any dealer should be able to supply you with an indicator bulb - just take one of the other ones with you for a pattern.
Look in the phone book for a car upholsterer for the seat cover. If they can't help they will know who can. It will work out cheaper (and probably quicker) than buying a genuine one.
Talk nicely to your local dealer and if he doesn't have the decals and fork boot he'll probably give you the numbers you need. Certainly all my local bike dealers have been helpful like this.